A hawk dives toward a snake. When the hawk is at a height of 200 feet the snake sees the hawk, which is diving at 105 ft/s. The snake has to escape in 1.54 sec.
What is Snake?
Any of the more than 3,400 species of reptiles in the suborder Serpentes known as snakes, often known as serpents, are differentiated by their lack of limbs and highly elongated bodies and tails. Snakes are grouped with lizards in the order Squamata and are an example of a lizard that has undergone structural reduction, simplicity, and loss along with specialisation during the course of evolution. However, not all legless reptiles are snakes, and not all snakes lack external limbs.
h= -16t² + vt + s
-16t²-105t+200=0
a=-16,b=-105 and c=200
Solving this quadratic equation using quadratic formula we get
t= (105+154.35)/-32 or (105-154.35)/-32
But t cannot be negative
Hence t=(105-154.35)/-32= 1.54 seconds
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give an example of a virus that affects plants
Answer:
(1) Tobacco mosaic virus, (2) Tomato spotted wilt virus, (3) Tomato yellow leaf curl virus, (4) Cucumber mosaic virus, (5) Potato virus Y, (6) Cauliflower mosaic virus, (7) African cassava mosaic virus, (8) Plum pox virus, (9) Brome mosaic virus
the functional role of sporopollenin is primarily to?
Sporopollenin is one of the most resistant organic compounds known. It protects pollen grains from external factors such as temperature, acid, alkali, etc. as sporopollenin is the component of the exine of plant spores.
The functional role of sporopollenin is primarily to provide protection and resistance to various external factors.
Sporopollenin is a tough and resistant biopolymer found in the outer walls of pollen grains and spores of plants. Its main function is to protect the reproductive cells during their dispersal and ensure their survival in challenging environments.
Sporopollenin provides a barrier against harmful ultraviolet (UV) radiation, desiccation (drying out), and chemical degradation. It also helps prevent damage from pathogens and provides resistance to physical stresses.
Additionally, sporopollenin plays a role in preventing water loss and acts as a shield against toxins and pollutants. Its robust nature and protective properties enable the successful transport and delivery of pollen and spores, facilitating plant reproduction and survival.
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suppose i grew escherichia coli in the presence of a radioactive isotope of phosphorous, 32p. in what molecules and parts of the cell would i find the radioactive material?
If you grew Escherichia coli in the presence of a radioactive isotope of phosphorus, 32P, the radioactive material would be incorporated into the DNA and RNA of the cell, as well as into various cellular compounds containing phosphorus such as ATP, phospholipids, and other phosphorylated compounds.
Phosphorus is a critical component of the molecule that makes up the genetic material in cells, DNA. As the cell grows and divides, it will incorporate the radioactive 32P into its DNA, making it possible to trace the movement and behavior of this isotope within the cell.
Additionally, the radioactive 32P will be incorporated into the cell's RNA molecules, which are involved in the transfer of genetic information from DNA to the cellular machinery that carries out the instructions encoded in the DNA.
The radioactive 32P will also be incorporated into other cellular compounds, such as ATP, the energy currency of the cell, as well as into phospholipids, which are a key component of the cell membrane, and other phosphorylated compounds.
By monitoring the distribution of the radioactive 32P within the cell, researchers can gain insights into the metabolic processes and the regulation of these processes, including DNA replication, RNA synthesis, and cellular energy production.
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which of the following increases the fidelity of dna replication? choose the one best answer. group of answer choices the 3' to 5' exonuclease activity of dna polymerase i. removal the rna flap by a flap endonuclease. a topoisomerase relieves supercoiling tension ahead of the replication fork. the sliding clamp
The sliding clamp is the answer choice that increases the fidelity of DNA replication.
The sliding clamp is a ring-shaped protein that encircles the DNA double helix and acts as a scaffold for the DNA polymerase enzyme during replication. By physically holding the DNA polymerase in place and preventing it from sliding off the template strand, the sliding clamp helps increase the processivity and accuracy of DNA replication.
The other answer choices listed (3' to 5' exonuclease activity of DNA polymerase I, removal of the RNA flap by a flap endonuclease, and a topoisomerase relieving supercoiling tension ahead of the replication fork) all play important roles in DNA replication, but they do not directly increase the fidelity of the process. The 3' to 5' exonuclease activity of DNA polymerase I helps remove misincorporated nucleotides, while the removal of the RNA flap by a flap endonuclease is important for maintaining the integrity of the replication fork. A topoisomerase helps relieve supercoiling tension that can impede DNA replication.
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what minimum percent must be exceeded for a deep-sea biogenic ooze to be named after its principal component?
Deep-ocean sediments are often categorised according to their biogenic components if the biological ingredients make up more than 30% of the total volume.
Defining ooze Is the biological productivity of surface water in a particular area always accurately predicted by the thickness of ooze?No, the ooze does not collect everywhere on the ocean floor, therefore it is not always a reliable indicator of biological productivity.
How much of ooze is made of biogenic material?The term "biogenic ooze" is also used for biogenic sediment. Any pelagic silt that contains skeletal material in amounts more than 30% must be known.
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choose all the substances that leave the blood by diffusing directly through the plasma membrane of endothelial cells?
All of the mentioned substances leave the blood by diffusing directly through the plasma membrane of endothelial cells.
Substances that are able to leave the blood directly through the plasma membrane of endothelial cells include:
O2 (oxygen), Dioxyde of carbon (CO2), gases that dissolve in water, like hydrogen sulfide (H2S) and nitric oxide (NO), Alcohol, and anesthetic gas are examples of small, non-polar molecules, molecules that dissolve in fat, like steroids and fatty acids.
Keep in mind that the molecule's size, charge, and lipid solubility all have an impact on the plasma membrane's permeability to these substances.
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(Complete question)
Oxygen (O2).
Carbon dioxide (CO2).
Water-soluble gases, such as nitric oxide (NO) and hydrogen sulfide (H2S).
Small, non-polar molecules such as alcohol and anesthetic gases.
Fat-soluble molecules such as fatty acids and steroids.
All of the above.
which events are thought to have played an important role in the evolution of eukaryotic cells? select all that apply.
All of the mentioned events are thought to have played an important role in the evolution of eukaryotic cells.
Eukaryotic cell evolution is thought to have been influenced by a number of key events, including the following:
1. Theory of endosymbiosis: The most widely accepted explanation for how eukaryotic cells came to be is this one. It asserts that symbiotic interactions between primitive prokaryotic cells like bacteria and archaea led to the development of eukaryotic cells. The first mitochondria, which are the organelles that are in charge of cellular respiration, were formed when one of these bacteria was taken over by another and evolved.
2. Diversification and duplication of chromosomes: In comparison to prokaryotic cells, eukaryotic cells have significantly more complex multiple linear chromosomes. Multiple rounds of chromosomal duplication and diversification are thought to have led to this complexity.
3. Nuclear envelope development: Eukaryotic cells are distinguished by the nuclear envelope, which separates the nucleus from the cytoplasm. It is thought that this structure evolved to protect the chromosomes and control how materials move between the nucleus and cytoplasm.
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(Complete question)
Theory of endosymbiosis
Diversification and duplication of chromosomes
Nuclear envelope development
All of the above
homologous chromosomes line up with their pair for crossing over in meiosis. how would you know if two chromosomes were homologous to each other?
A homologous pair of chromosomes has two identically sized and shaped chromosomes that are highly similar to one another.
What are homologous chromosomes?The fact that they share the same type of genetic information i.e., have the same genes in the same places is crucial.
Through homologous recombination and crossover at chiasmata between non-sister chromatids, DNA exchanges between homologous chromosomes take place.
The homologous pairs then arrange themselves at the metaphase plate. Then, during anaphase I, the homologous chromosomes split apart and moved to the cell's opposite poles.
Therefore, homologous chromosomes share the same type of genetic information.
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3. in this same population, there is a total of 10,000 people. how many of these people are homozygotes for the brown-eyed allele, heterozygotes, and homozygotes for the blue-eyed allele?
The number of individuals with each genotype depends on the frequency of the alleles in the population, and the way in which they are passed from one generation to the next.
For example, if the frequency of the brown-eyed allele (B) is 0.8 and the frequency of the blue-eyed allele (b) is 0.2, the number of individuals with each genotype can be calculated using the rules of Mendelian inheritance.
The frequency of heterozygotes (Bb) would be 0.64, and the frequency of homozygotes for the brown-eyed allele (BB) would be 0.64. The frequency of homozygotes for the blue-eyed allele (bb) would be 0.04.
Additionally, the distribution of genotypes in a population is not always predictable based on allele frequencies, as other factors such as mutation, migration, and selection can also influence the distribution of alleles in a population.
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What was a problem with Aristotle’s way of classifying organisms?
Answer:
Aristotle's way of classifying organisms was a major problem because it was based on observable characteristics and morphological similarities, rather than on evolutionary relationships. He divided all living things into two main categories: plants and animals, and then further divided each of these categories into subcategories based on specific characteristics such as size, shape, habitat, and behavior.
However, this classification method did not consider the evolutionary relationships between species, which meant that organisms that were more closely related to each other could be classified into different categories based on superficial differences. This made it difficult to accurately understand the relationships between different species and trace their evolutionary history.
In addition, Aristotle's classification method was limited by his own biases and lack of knowledge about the natural world. He believed that certain species were inherently superior to others and that humans were the most superior species. This led to a hierarchical classification system that was not based on scientific evidence and reflected cultural and ideological biases rather than biological reality.
Overall, Aristotle's way of classifying organisms was problematic and was eventually replaced by the modern classification system, which is based on evolutionary relationships and uses a branching tree diagram called a phylogenetic tree to depict the evolutionary relationships between species.
The most superficial layer of skin is the _____.
Answer:The epidermis
Explanation:The epidermis is the most superficial layer of the skin and provides the first barrier of protection from the invasion of substances into the body. The epidermis is subdivided into five layers or strata: stratum basale. stratum spinosum.
Output: information sent along pathway to effector
Homeostasis
: Blood sugar Regulation
Answer:
Explanation:
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Animals that possess homologous structures probably _____. See concept 26. 2 (page 556) view available hint(s) animals that possess homologous structures probably _____. See concept 26. 2 (page 556) evolved from the same ancestor are the result of convergent evolution have increased genetic diversity are the result of similar environmental pressures in different evolutionary lineages are not related submit
Animals with similar structures most likely have a common ancestor. Homologous structures are body parts or organs that are present in various species .
Body parts or organs that are identical in structure and function yet are found in various species are known as homologous structures. The notion of evolution by natural selection is supported by the idea that these structures share a common evolutionary ancestor. For instance, although though the forelimbs of diverse mammal species—including humans, horses, and bats—have varied tasks, they all share a similar bone structure. This resemblance shows that these animals shared a common ancestor during their evolution and that the forelimbs have changed over time to accommodate the unique requirements of each species. Homologous structures can be utilised to recreate the evolutionary history of a collection of animals and offer proof for the ties between species that have developed over time.
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pedigree b is most likely autosomal dominant. what is/are the genotype(s) of the parent(s) that transmitted the mutant allele(s) to their offspring?
without sufficient details, the genotype(s) of the parent(s) that transmitted the mutant allele(s) to their offspring
The genotype of the parent(s) who passed the mutant allele(s) to their kids cannot be ascertained without sufficient details about the particular pedigree in question.
Individuals with the mutant allele are afflicted in an autosomal dominant pedigree and can pass the mutant allele to their progeny. An autosomal dominant pedigree's pattern of transmission gives each affected person a 50% probability of passing on the mutant gene to each of their progeny.
However, the genotypes of the individuals in the pedigree, as well as any further details regarding the specific mutation and how it is inherited, would be required to identify the parent(s) who transmitted the mutant allele(s). Additionally, more than one person in a pedigree can possess the mutant allele in some circumstances, making it challenging to determine which parent transmitted the mutant allele based on the available data.
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scenario 1a 2. does this increase (they are less similar), decrease (they are more similar), or maintain (there is no change) the genetic diversity between the two populations?
The genetic diversity between the two populations is decreased (they are more similar).
Thus, the answer is decrease (they are more similar).
Аll living things on Eаrth contаin а unique code within them, cаlled DNА. DNА is orgаnised into genes, similаr to the wаy letters аre orgаnised into words. Genes give our bodies instructions on how to function. However, the exаct DNА code is different even between individuаls within the sаme species. We cаll this genetic diversity. Genetic diversity cаuses differences in the shаpe of bird beаks, in the flаvours of tomаtoes, аnd even in the colour of your hаir! Genetic diversity is importаnt becаuse it gives species а better chаnce of survivаl. However, genetic diversity cаn be lost when populаtions get smаller аnd isolаted, which decreаses а species’ аbility to аdаpt аnd survive.
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based on your understanding of the function of the germinative layer, explain why the cells in and around that layer are tighly packed?
The stratum germinatum (SG) provides the germinal cells required for epidermal layer renewal. A small layer of basement membrane separates these germinal cells from the dermis.
Basal cells proliferate regularly, and new cells constantly push older ones up toward the skin's surface, where they are eventually shed. Because it is continually germinating (creating) new cells, the basal cell layer is also known as the stratum germinativum.
The basement membrane (basal lamina) separates the stratum basale from the dermis and is connected to the basement membrane by hemidesmosomes.
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epithelial tissue is classified by the number of layers of cells and the shape of the cells on the __________ surface.
Answer: The surface epithelium is classified according to its number of layers, cellular structure, and function. There are three epithelial cell shapes: cuboidal, columnar, and squamous. Cuboidal epithelial cells are shaped like a cube and have a spherical nucleus in the center.
Explanation:
based on the five assumptions of hardy-weinberg equilibrium, which assumption directly addresses genetic drift? why does this lead to evolution if this assumption is not met?
The Hardy-Weinberg principle is founded on a number of assumptions, including a huge population and the absence of natural selection. No selection, no gene flow, no random mating, no new mutations, and so on.
The formula p²+2pq+q²=1 may be used to get the allelic frequency. The shift in the frequency of allel inside a population over time is referred to as genetic drift. As genetic drift to occur, this change in allel frequency must be random. Population size influences the amount of alleles present in a population. Small population numbers introduce unpredictable features such as genetic drift. Fixation of alleles or genotypes in a population is caused by genetic drift.
As a result, the Hardy-Weinberg principle of no genetic drift requires a high or infinite population size. In the absence of additional evolutionary forces, the Hardy-Weinberg principle, also characterized as the Hardy-Weinberg equilibrium, model, theorem, and rule in population genetics, maintains that allele & genotype frequencies in a population would stay constant from generation to generation.
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in addition to a plasma membrane, a eukaryotic cell has organelles, such as mitochondria, that also have membranes. in which way would these membranes differ?
A plasma membrane, a double layer of lipids that separates the cell interior from the outside environment, is found in both prokaryotic and eukaryotic cells.
This double layer is mostly made up of phospholipids, which are specialized lipids. A phospholipid is made up of two hydrophobic, water-fearing fatty acid tails and a hydrophilic, water-loving phosphate head.
Phospholipids spontaneously form a double-layered structure with hydrophobic tails pointing inward and hydrophilic heads pointing outward. Many biological membranes contain this energetically advantageous two-layer structure known as a phospholipid bilayer.
Some of them travel all the way through the membrane, acting as channels or signal receptors, while others are only attached at the membrane's edge. Different lipids, such as cholesterol, can be found in the cell membrane and influence its fluidity.
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While eukaryotic cells have a plasma membrane that surrounds the entire cell, the membranes of organelles such as mitochondria differ in their lipid composition, protein content, and structure. These differences are essential for the specialized functions of these organelles within the cell.
Eukaryotic cells, which include animal and plant cells, contain a number of different organelles that carry out specific functions within the cell. These organelles are membrane-bound structures that are distinct from the plasma membrane that surrounds the cell as a whole. One important feature of these organelles is that they also have membranes, but these membranes differ in certain ways from the plasma membrane.
The plasma membrane is a phospholipid bilayer that surrounds the entire cell, providing a barrier between the inside and outside of the cell. It is composed of two layers of phospholipids, which have a hydrophilic (water-loving) head and a hydrophobic (water-repelling) tail. Other components of the plasma membrane include cholesterol, which helps to maintain its structure, and various proteins, which carry out a range of functions such as transporting molecules across the membrane and signaling to other cells.
The membranes of organelles such as mitochondria, on the other hand, have a number of differences from the plasma membrane. One key difference is that they may have different lipid compositions. For example, the membranes of mitochondria contain a high proportion of cardiolipin, a type of phospholipid that is not found in other cellular membranes. This difference in lipid composition is thought to play a role in the unique functions of the mitochondria.
In addition to differences in lipid composition, the membranes of organelles also contain different sets of proteins that are specialized for their specific functions. For example, the membranes of mitochondria contain a number of enzymes that are involved in the process of cellular respiration, which generates energy in the form of ATP. Other organelles, such as the endoplasmic reticulum, have specialized proteins that are involved in protein synthesis and folding.
Another important difference between organelle membranes and the plasma membrane is that some organelles have multiple layers of membranes. For example, the chloroplasts found in plant cells have an outer membrane and an inner membrane, with a space in between them known as the intermembrane space. These additional layers provide additional surface area for chemical reactions and allow for compartmentalization of different functions within the organelle.
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3. what is the main purpose for fermentation reactions?multiple choice 3create alcohol as a nutrient for further processingproduce carbon dioxideregenerate nad molecules for glycolysisproduce more atp per glucose than glycolysis alone
Fermentation reactions are used to regenerate NAD molecules for glycolysis, resulting in more ATP per glucose and creating alcohol as a nutrient and carbon dioxide as a byproduct.
What is fermentation?Fermentation is the metabolic process through which sugars and other organic substrates are converted into acids, alcohols, and other compounds. It is an old method of producing beer, wine, bread, yoghurt, and other foods. Yeast or bacteria convert sugar into carbon dioxide, alcohol, or acids during fermentation. Fermentation products might differ based on the type of organism and the conditions under which it is cultivated.
Fermentation processes are mostly used to renew NAD molecules for glycolysis. When glucose is broken down by glycolysis, two molecules of NAD+ are used. These two molecules must be regenerated in order for glycolysis to proceed. This is accomplished by fermentation processes that convert NADH back into NAD+. This permits glycolysis to continue, resulting in more ATP per glucose produced than by glycolysis alone. Furthermore, certain fermentation activities release carbon dioxide as a byproduct while producing alcohol as a nutrient for further processing.
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in a thylakoid membrane, absorbed light energy is passed from one antenna chlorophyll molecule to another until it is:
In a thylakoid membrane, the light energy absorbed is passed from one antenna chlorophyll molecule to another until it is: passed to a reaction center.
Reaction centers are the central pigment involved in the conversion of light energy into chemical energy. In plants chlorophyll a acts as the reaction center. It is surrounded by various other small pigments that absorb energy and provide in to the reactions center.
Chlorophyll is the pigment present in plants involved in the process of photosynthesis by absorbing the solar energy. There are various types of chlorophylls like: chlorophyll a, chlorophyll b, chlorophyll c, etc. The main pigment us chlorophyll is chlorophyll a.
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if dna were extremely stable, replication and transcription would not be possible. unwinding of the double helix occurs under a variety of conditions. which statement(s) is/are true of this process?
The statement that true about replication and transcription, If the double helix were not unwound, which takes place frequently, the assertion that replication and transcription are true would not be possible. Denaturation is the result of long stretches of DNA unraveling.
When the temperature is high, the TΔS term dominates the ΔH term, favoring the process. Cooling allows for renaturing, the process of rebuilding DNA duplex structure.
DNA helicases unwind DNA at locations known as origins during DNA replication, where synthesis will begin. The replication fork is a structure that develops while DNA helicase continues to unwind the DNA. It is so named because the two strands of DNA appear to fork as they are unzipped apart. Energy is needed to dissociate the hydrogen bonds that hold the double-stranded DNA's nucleotide base pairs together.
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Society is like a biological organism, with each organ dependent on the others for survival.a. Trueb. False
Society is like a biological organism, with each organ dependent on the others for survival is true.
The dominant-recessive link between the C and c alleles can be used to explain this outcome. Each offspring of two heterozygous dogs (C/c) has a 50% chance of getting either the dominant C allele from one parent or the recessive c allele from the other. In this instance, the smooth-haired puppy (c/c) expressed the smooth hair phenotype due to inheriting two copies of the recessive c allele.
The genotype of the parents can be deduced from the phenotype of the offspring, but without additional genetic testing, it is not possible to know the precise combination of alleles that each parent contributed to the offspring.
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Question 2
Why did the state emerge as a political form approximately 10,000 years ago?
All of the answers are correct.
O State societies developed because of the need for protection and strength in numbers.
State societies developed because of dependence on irrigation.
O The introduction of intensive agriculture created food surpluses, which allowed some individuals
to engage in new occupational roles.
O State societies developed because of the needs of agricultural intensification
All of the answers are correct. The emergence of the state as a political form approximately 10,000 years ago was a complex process that was influenced by several factors. The need for protection and strength in numbers, dependence on irrigation, the introduction of intensive agriculture that created food surpluses, and the needs of agricultural intensification were all important factors that led to the emergence of state societies. As societies grew in size and complexity, they required centralized power structures to organize and control the population, leading to the formation of states.
acetobacter aceti is a bacterial species involved in the production of acetic acid during vinegar production. which category would this bacteria be classified within?
The bacterial species in the question above would be classified within the neutrophile category.
Neutrophile is a type of organism that thrives in a neutral pH environment, between pH 6.5 and 7.5. This category covers most bacteria, since bacterias tend to grow optimally at pH within one or two pH units of the neutral pH (pH 7), so between pH 5 and 8.
Acetobacter aceti is a type of bacteria that moves using its flagella. It is used to produce acetic acid during vinegar production; a function first found in 1864 by Louis Pasteur.
Attached below is an illustration of the acetobacter aceti.
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as the concentration of receptors on the cell membrane decreases, the response of the target cell will
A hormone's target cells may express fewer hormone receptors when there is a considerable amount of that hormone present in the circulation. Downregulation is the mechanism that enables cells to become less sensitive to high hormone levels.
How does the number of active receptors in the target cell impact activation of the target cell?In response to hormone action, a target cell's number of receptors may rise or fall. Through plasma membrane hormone receptors or intracellular hormone receptors, hormones can directly or indirectly impact cells.
The quantity of that hormone's receptors present in the target cell influences its sensitivity to that hormone. The sensitivity of the target cell increases with the number of receptors.
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examination of a sample of granular cells shows an extensive network of smooth er. which would be a likely product of these cells?
Steroid hormones are the appropriate response. The generation of steroid hormone and the metabolism of fat are believed to be connected in cells with a dense network of SER.
Most eukaryotic cells have the smooth endoplasmic reticulum (smooth ER), a membrane organelle. It is a portion of the endoplasmic reticulum's endomembrane system. The endoplasmic reticulum (ER) is a vast network of membrane tubules, vesicles, and flattened cisternae (sac-like structures) present in every eukaryotic cell, particularly those in charge of producing hormones and other secretory products. Particularly, it is frequently noticeable in cells with a focus on lipid metabolism. cells that use cholesterol to create steroid hormones.
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Challenges for survival of the first land plants include
I. sources of water.
II. sperm transfer.
III. desiccation.
IV. animal predation.
A) I only
B) II only
C) II, III and IV only
D) I, II and III only
The greatest test that early land plants needed to confront ca. quite a while back was getting by in dry, non-lowered conditions. Green growth extricates supplements and light from the water that encompasses them. The correct answer is (D) I, II, and III only.
There are four significant difficulties to plants living ashore: acquiring assets, remaining upstanding, keeping up with dampness, and replicating. Getting Assets From Two Spots Without a moment's delay Green growth and other sea-going organic entities procure the assets they need from the encompassing water.
Plants are remembered to have developed from an amphibian green alga protist. Afterward, they developed significant transformations for land, including vascular tissues, seeds, and blossoms. Every one of these significant transformations improved plants appropriate for life on dry land. The most established fossils of land plants date back around 470 million years.
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What bone structure lines the medullary cavity of a long bone?
Endosteum is the bone structure that lines the medullary cavity of a long bone.
The medullary cavity is lined by a thin membrane called the endosteum (endo- = within). It has a thin layer of connective tissue and one layer of bone-forming cells. A long bone is one whose length exceeds its width. A long bone has two ends and a shaft. Long bones feature an inner medullary cavity containing bone marrow and a thick outer covering of solid bone.
Adults have a hollow, cylindrical region within the diaphysis called the medullary cavity, also known as the marrow cavity, which houses a large number of blood vessels and fatty yellow bone marrow. By removing dense bony tissue from the area of the bone that is least needed, this hollow reduces the weight of the bone. The tubular structure of the long bones offers greatest strength with minimal weight.
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15. Water has a high specific heat capacity. it means that it: a. heats up and cools down slowly b. heats up slowly but cools down quickly c. heats up quickly but cools down slowly d. heats up and cools down quickly
Answer: Heats up slowly and cools down quickly
Explanation: Think of a pot of boiling water it takes a little bit for it to heat up but it cools down fairly quickly or may or maybe a tub of hot water you can start it off with hot water but after sitting in it for a little bit it cools down. Answer is B