Eradication of smallpox, Control of the rodent populations harboring the bacteria causing the plague, and the measles, mumps rubella, varicella vaccine (MMRV) are some triumphs whereas HIV/ AIDS, Hantavirus pulmonary syndrome and SARS are still some of the challenges that we face.
Smallpox has not occurred anywhere in the world since the year 1977. It has been basically eliminated as a naturally occurring infection in the human beings and this has been made possible by an effective vaccination. Plague caused by rodents harboring bacteria killed about 1/3 of the population of Europe in 14th century which has now been under control.
The MMRV vaccine is a very safe vaccine and is effective in the prevention of measles, mumps, rubella, and varicella. There is no current specific treatment, vaccine or cure for the hantavirus infection, SARS or HIV/AIDS which pose major challenges in healthcare.
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A test cross involves crossing with a(n) _________ individual and is used to determine the _________ of the tested parent.
A. homozygous dominant; phenotype
B. homozygous recessive; phenotype C. homozygous dominant; genotype D. homozygous recessive; genotype
A test cross involves crossing with a(n) homozygous recessive individual and is used to determine the genotype of the tested parent.
What is genotype?An organism's genotype is its whole collection of genetic material. The term "genotype" can also refer to the alleles or variations that an individual possesses in a certain gene or genetic region. In a general sense, the term "genotype" refers to an organism's genetic composition; in other words, it characterizes an organism's whole collection of genes. Homozygous recessive (pp), homozygous dominant (PP), and heterozygous genotypes are the three types of genotypes (Pp). The phenotypes of homozygous dominant and heterozygous genotypes are the same.
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Which statement is true
An animal cell does not have a Golgi, but a plant cell can have a Golgi.
The cytoplasm of an animal cell is inside the cell membrane.
In animal cells, lysosomes break down waste and worn-out cell parts.
Answer:
The cytoplasm of an animal cell is inside the cell member
Studying a the sediment layers in a rock formation, a biologist can assume that the organisms found in the upper layers
Question 11 options:
are relatively older than those found in lower layers
are exactly 3.2 million years older than an organism found 3.2 meters lower
you cannot tell anything about the relative age of a fossil
are relatively younger than those found in lower layers
A biologist can estimate that the creatures found as in upper layers of silt inside a rock formation are precisely two million years old than an organism located 3.2 meters beneath.
What do the layers of rock reveal?Fossils found in rock layers are proof of previous landscapes on Earth. It is difficult to estimate the date of rock. To discover how distant past rocks formed, scientists must solve a problem like a detective. Scientists can identify the age of a rock by looking for fossils in a particular layer of rock.
Why may it be assumed that older rock strata layers can be found beneath newer sedimentary rock layers?the scientific idea that, in horizontal strata of bedrock, each layer, if left undisturbed, is older than that of the one above and newer than that of the layer below it.
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The scientific name for the kind of cat you might have as a pet is Felis domesticus. What is its genus?
The genus of Felis domesticus is felis, while domesticus is species of a cat.
What is a genus?A genus is a collection of closely related creatures that most likely have a common ancestor.
In other words, It is a biological classification system that places families and species in ascending order, with families made up of structurally or phylogenetically related species and species that are isolated from one another and display exceptional differentiation.
Hence, in Felis domesticus (the scientific name of a cat), Felis is genus and domesticus is species.
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Explain why aerotolerant and microaerophilic microbes can't survive high oxygen levels but they can survive low levels.
Answer:
it’s A
Explanation:
You take a snorkeling trip and see many fish, corals, and even some dolphins. Your snorkeling trip is an example of which ecosystem service?
Question 36 options:
ecosystem regulation and support
human provisions
cultural benefits
ecosystem diversity
Answer:
human provisions ecosystem
2. List the features found in prokaryotes but not eukaryotes. What are advantages provided by these features?
The absence of any membrane-bound organelles, such as a nucleus, distinguishes prokaryotic cells from eukaryotic cells. Prokaryotic cells only have ribosomes, an outer plasma membrane, and a DNA nucleoid structure.
What do organisms actually mean in biology?
A biological organism is a living thing that has the capacity to respond to environmental cues, reproduce, grow, and preserve homeostasis. Taxonomy divides living things into various categories, such as metazoa, which includes animals, plants, and fungi, and single-celled organisms like archaea and protists.
Why are organisms given names?
Every recognized species on Earth has two scientific names, at least in theory. The term "binomial nomenclature"
refers to this system. These names are significant because they enable clear communication about various animal species among people all over the world.
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the scientific name of the american copperhead is agkistrodon contortrix and the scientific name of the australian pygmy copperhead is austrelaps labialis. based on this information, which of the following statements is true?
The correct statement about American Copperhead having the scientific name Agkistrodon contortrix and Australian Pygmy Copperhead having the scientific name Austrelaps labialis is that: (4) None of the given options are correct.
Scientific name is the formal name given to any species over the world according to the Binomial Nomenclature. The purpose of each species having a scientific name is that it can be identified by scientists because the common names change from one place to another.
Copperheads are the venomous snakes majorly found across the eastern United States in terrestrial and semiaquatic habitats. They are generally called copperheads due to their bronze-hued heads. These snakes are vary large and social in nature.
The given question is incomplete, the complete question is:
The scientific name of the American Copperhead is Agkistrodon contortrix and the scientific name of the Australian Pygmy Copperhead is Austrelaps labialis. Based on this information, which of the following statements is true?
Both copperheads are of the same species.Both copperheads are classified in the same genus. The common name copperhead must mean the two snakes are closely related.None of the given options are correct.To know more about scientific name, here
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what is the role of hydrogen i nthe synthesis of a fat that is unsaturated and therefore an oil at roo mtermperatrure g
The role of hydrogen in the synthesis of saturated fats is that hydrogen when added to the unsaturated fats converts them into saturated fats and helps them solidify.
By converting all of the double bonds in the fat to single bonds, full hydrogenation causes all of the unsaturated fats to change into saturated fats. Partial hydrogenation eliminates certain double bonds by partially replacing them with single bonds, but not all of them. Remember that an alkene becomes an alkane when hydrogen is added to it.
An example for a hydrogenation reaction:
[tex]H^{2}C[/tex]=[tex]CH^{2}[/tex] + [tex]H^{2}[/tex] → [tex]CH^{3}CH^{3}[/tex]
In this reaction the reactant is alkene, which is an unsaturated hydrocarbon, while the product formed by hydrogenation, alkane, is a saturated hydrocarbon. Commonly referred to as "polyunsaturated," vegetable oils. This only indicates the presence of several double bonds. The hydrogenation reaction can turn liquid vegetable oils into solids. This "hardening" process turns margarines and shortenings into solids or semi-solids.
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Which of the following affects the rate of diffusion through a selectively permeable membrane?
I. concentration gradient
II. temperature
III. molecular size
The correct answer is I) concentration gradient, II) temperature and III) molecular size.
1. Concentration gradient: the greater the concentration gradient (the difference in concentration between two areas), the faster the rate of diffusion. Molecules will move from an area of higher concentration to an area of lower concentration until equilibrium is reached.
2. Temperature: the higher the temperature, the faster the rate of diffusion. This is because molecules have more kinetic energy at higher temperatures, which allows them to move and diffuse more rapidly. third
3. Molecular size: smaller molecules can diffuse faster than larger molecules. This is because smaller molecules can move more easily through the pores of a selectively permeable membrane.
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Can you think of any possible solutions stopping or decreasing the violence between women and men
when protein provides energy, the body must eliminate the containing amine group and other solutes from protein breakdown. True or False
It is true as when protein provides energy, the body must eliminate the nitrogen-containing amine group as well as other waste products from protein breakdown through the process of deamination. The resulting nitrogen-containing waste is eliminated from the body in the form of urea, which is excreted in the urine.
What is protein?Proteins are huge biomolecular and macromolecular structures made up of one or more long chains of amino acid residues. Proteins are required for life and are required for a variety of biological processes. The vast majority of chemical processes in the cell are catalyzed by protein enzymes. Proteins supply many of the structural features of a cell and aid in the fusion of cells into tissues. Proteins defend animals from sickness in the form of antibodies, and many hormones are proteins. Proteins regulate gene expression and modulate gene activity.
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in order for actin to bind to myosin, the active sites on the actin molecule must be uncovered. this involves the movement of tropomyosin by the protein
In order for actin to bind to myosin, the active sites on the actin molecule must be uncovered. this involves the movement of tropomyosin by the protein Troponin.
Troponin, also known as the troponin complex, is a collection of three regulatory proteins (troponin C, troponin I, and troponin T) that are essential to the process of muscle contraction in skeletal muscle and cardiac muscle, but not in smooth muscle.
In the treatment of myocardial infarction and acute coronary syndrome, measurements of cardiac-specific troponins I and T are employed widely as diagnostic and prognostic indicators in the management of these conditions. Despite the fact that this measurement has low sensitivity, measuring the levels of troponin in the blood can be used as a diagnostic marker to determine whether or not a patient is suffering from a stroke or another type of persistent myocardial injury.
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Select the correct sequence of events of the human menstrual phase, beginning and ending with the menstrual cycle.
The correct sequence of events of the human menstrual phase, beginning and ending with the menstrual cycle is a menstrual phase, proliferative phase, ovulation, secretory phase, and menstrual phase.
Menstruation, the follicular phase, ovulation, and the luteal phase are the four stages that make up a woman's monthly reproductive cycle. Some of the most common menstrual issues include painful or heavy periods as well as premenstrual syndrome (PMS).
It is possible to boost the likelihood of a woman becoming pregnant by learning the stage of her menstrual cycle at which she is most fertile.
The complete question is.
Select the correct sequence of events of the human menstrual phase, beginning and ending with the menstrual cycle.
A. menstrual phase, proliferative phase, ovulation, secretory phase, menstrual phase
B. menstrual phase, ovulation, secretory phase, proliferative phase, menstrual phase
C. menstrual phase, secretory phase, proliferative phase, ovulation, menstrual phase
D. menstrual phase, proliferative phase, secretory phase, ovulation, menstrual phase.
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What is Asexual Reproduction?
Answer: Asexual reproduction is a mode of reproduction in which a new offspring is produced by a single parent. The new individuals produced are genetically and physically identical to each other, i.e., they are the clones of their parents.
Explanation:
When exposed to air, the flesh of apples turn brown. Arctic apples are a result of introducing an anti-browning gene in the apple’s genetic makeup. Which technology was most likely used to produce the anti-browning property of the Arctic apple?
Answer: Genetic
Explanation:
The introduction of an anti-browning gene into the genetic makeup of apples would produce arctic apples in which the ability to resist browning was created through genetic engineering techniques. So, the correct option is C.
What are Genetically modified foods?Genetically modified (GM) foods are defined as foods that are derived from organisms whose genetic material (DNA) has been modified in a way that does not occur naturally, e.g. through the introduction of genes from a different organism.
The flesh of apples turns brown when exposed to air. To avoid this browning, Arctic apples are genetically modified (GE) which indicates that biotechnology methods were used to modify the genetic material that controls how the apple tree grows and develops.
So, the correct option is C.
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Your question is incomplete, most probably the complete question is:
When exposed to air, the flesh of apples turn brown. arctic apples are a result of introducing an anti-browning gene in the apple’s genetic makeup. which technology was most likely used to produce the anti-browning property of the arctic apple?
a. xeno transplantation
b. bt gene production
c. genetic engineering
d. half-life determination
what is the primary pressure on species to change over time.
The primary pressure on species to change over time is natural selection. Natural selection is the process by which certain traits become more or less common in a population over time as a result of the differential survival and reproduction of individuals with those traits. It occurs because not all individuals in a population can survive and reproduce, and those that do so successfully pass their traits on to their offspring. Over many generations, this can lead to changes in the traits and characteristics of a species, allowing it to better adapt to its environment and increasing its chances of survival.
choose which of the following pairs of organisms are most closely related and have correctly written names.
The following organism pairs have Staphylococcus aureus and Staphylococcus epidermidis, which are most closely related and have the proper names.
Staphylococcus aureus: what is it?The gram-positive bacteria Staphylococcus aureus is responsible for a variety of clinical diseases. This bacterium frequently causes both illnesses obtained in the community and infections acquired in hospitals. Treatment is difficult since MRSA and other multidrug-resistant bacteria are on the rise (Methicillin-Resistant Staphylococcus aureus).
Normal, healthy skin is resistant to S. aureus infection, but if the germs get inside the body or into the bloodstream, they can cause a number of potentially harmful disorders. This activity covers the identification, prognosis, and treatment of Staphylococcus infections as well as the role of the interprofessional team in the care of patients with these illnesses.
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Which three types of cells have cell walls
Answer:
Algae, fungi, and plant cells have a cell wall; animal cells and protozoans lack cell walls.
Explanation:
The rigid, tightknit, polysaccharide molecular structure of the cell wall helps the cell resist osmotic lysis.
Dialysis tubing is a cellulose material used to make model cells for experiments in osmosis and diffusion. These model cells do not use living cell membranes. A student made a model cell by pouring distilled water into some dialysis tubing. The student placed the model cell in a salt solution and waited 10 minutes. The cell was then removed from the salt solution and the contents were poured into the test tube. The student added silver nitrate to the test tube and a white precipitate formed. This indicated that chloride ions had entered the cell. Would this be true for living cell membranes? Design an experiment to test this.
Experiment:
Materials:
-Living cell membrane (from a plant or animal cell)
-Dialysis tubing
-Salt solution
-Test tube
-Silver nitrate
Procedure:
1. Place the living cell membrane in the dialysis tubing.
2. Submerge the dialysis tubing with the cell membrane into the salt solution and wait for 10 minutes.
3. Remove the dialysis tubing from the salt solution and pour the contents into the test tube.
4. Add silver nitrate to the test tube and observe the results.
5. Record the observations and compare with the results of the experiment using the dialysis tubing.
Expected Results: If chloride ions have entered the living cell membrane, a white precipitate should form when the silver nitrate is added to the test tube.
What is Dialysis tubing?Generally, Dialysis tubing is a type of semi-permeable membrane tubing used in a lab setting to separate molecules in solution based on their size. It is commonly used to separate proteins from small molecules and to purify DNA and RNA molecules.
The tube is made from cellulose, which allows molecules smaller than the pore size to pass through the membrane while larger molecules are retained.
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The group in an experimental study that is a reference differing from the test group in only one way is the _________ group.
Question 3 options:
placebo
uncontrolled
validation
control
Explanation:
It would be a control group as the control group is the baseline group to compare the other findings too, as a control group is a controlled group with no changing variables.
In eudicot seeds, the ______ are the seedling leaves and have absorbed much of the endosperm.
cotyledons
coleoptiles
meristems
hypocotyl and radicle
In eudicot seeds, the cotyledons are the seedling leaves and have absorbed much of the endosperm.
What is cotyledon?A seed's embryo contains a leaf-like structure known as a cotyledon. Cotyledons contribute to the provision of the nourishment a plant embryo requires in order to germinate and become established as a photosynthetic organism. Cotyledons may themselves be a source of nutritional reserves or may assist the embryo in metabolizing nourishment stored in other parts of the seed.
When it comes to certain seeds, the cotyledons are the organs responsible for the absorption of nutrients from the seed's stores. These cotyledons will subsequently expand when exposed to light and become the seed's first photosynthesis-producing organs.
In many monocots, the cotyledon serves as a specialized organ of absorption that is responsible for the mobilization of reserve materials and the withdrawal of these elements from the endosperm. Regardless of whether cotyledons aid in the absorption of nutrients from the endosperm or store the nutrients themselves, these embryonic seed leaves often do not survive for an extended period of time following germination.
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if a white blood cell engulfs a foreign particle with its pseudopods, it traps the particle in a structure called a in its cytoplasm.
When a white blood cell engulfs a foreign particle with its pseudopods, it traps the particle in a structure called vacuole in its cytoplasm.
What is meant by white blood cells?A low white blood cell count generally means your body is not making enough white blood cells and can increase your risk of getting infections.
White blood cells are part of body's immune system and they help body fight infection and other diseases. Types of white blood cells are as: granulocytes (neutrophils, eosinophils, and basophils), monocytes, and lymphocytes (T cells and B cells).
High white blood cell count indicates that the immune system is working to destroy infection.
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A population of 40 guinea pigs undergoing natural selection is reduced to 20 individuals in only five generations. At this point genotype frequencies are 0.25, 0.5, and 0.25 for the genotypes AA, Aa, and ag, respectively. Assume that natural selection continues to act on this population. Is the population in Hardy-Weinberg equilibrium? Why or why not?
No, the population is not in Hardy-Weinburg equilibrium because the populations described here are being subjected to natural selection and does not have a large size.
The Hardy-Weinberg principle presupposes that a population is sizable and not undergoing natural selection, sexual selection, migration, or mutation, and have a large population. Even though no population in the real world can meet all of these requirements, the concept nonetheless provides a valuable framework for population analysis. As the population of pigs in the query is reduced and is undergoing natural selection, the population is not in equilibrium.
According to the Hardy-Weinberg principle, a population's genotype and allele frequencies will not change in the absence of any evolutionary processes. p + q = 1, where p is the frequency of the dominant allele and q is the frequency of the recessive allele, can be used to calculate the frequency of alleles in a population.
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The reason that radiocarbon dating results must be calibrated is that, contrary to what Libby assumed
In contrast to what Libby believed, the proportion of 14C in the atmosphere has really altered through time, radiocarbon dating results must be calibrated.
From the air, how are archaeological sites found?Sites may be visible from the air as frost marks, crop marks, soil marks, or shadow marks. Using computer-generated mapping tools, archaeologists can plot and examine site distributions in relation to environmental and other background data obtained from remote sensing, digital maps, and other sources.
Can you list the justifications for the need to calibrate radiocarbon dates?The dates produced by radiocarbon dating are not exact calendar years, which is why they need to be calibrated. Contrary to earlier assumptions, the amount of 14C in the atmosphere changes throughout time.
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Ellis and Carney (2011) conducted a study to investigate the effects of the environment on gene expression, the research conducted was?
I can tell you that the study of the effects of the environment on gene expression falls under the field of Epigenetics, which is the study of changes in gene expression that occur without any changes to the underlying DNA sequence.
What is genes?Genetics is the study of genes, genetic variation, and heredity in organisms. It is an important topic in biology because heredity is fundamental to organism evolution. In the nineteenth century, Gregor Mendel, a Moravian Augustinian monk working in Brno, was the first to do scientific study on genetics. The basic unit of inheritance that is passed down from parent to child. Genes are composed of DNA sequences that are organized one after the other in the nucleus of cells at certain chromosomal sites.
Here,
The environment can play a significant role in gene expression, by affecting the way that genes are regulated. This can occur through mechanisms such as DNA methylation, histone modification, and changes in the way that non-coding RNA molecules interact with DNA. Understanding the effects of the environment on gene expression can provide important insights into how environmental factors can contribute to the development of diseases and other health conditions.
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Which of the following are NOT typical monomer arrangements in a polymer.
A. Ceramically
B. Branching
C. Crystalline
D. Lined-up
Answer:
A. Ceramically
Explanation:
Polymers can have various structures, and they are composed of repeating units called monomers. Some of the typical monomer arrangements in polymers are branching, crystalline, and lined-up. Ceramics are not a typical monomer arrangement in polymers because they are a completely different class of materials that have a different structure and properties.
when a cell is in osmotic equilibrium with the internal environment, which of the following occurs for water movement through aquaporins?
When a cell is in osmotic equilibrium with the internal environment, there is random movement of water molecules into and out of the cell occurs for water movement through aquaporins.
Water diffuses through a semipermeable membrane as a result of osmosis. In living things, osmosis is crucial because it controls the flow of water into and out of cells. Because tiny molecules may get through the plasma membrane only under certain conditions, the internal makeup of the cell is preserved.
The majority of biological molecules cannot diffuse through the phospholipid bilayer. The plasma membrane creates a barrier that prevents molecules from freely moving between the cytoplasm and the cell's surroundings.
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Create hierarchy chart relating the following terms: acidophile, archaea, bacillus, bacteria, coccus, halophile, methanogen, prokaryote, spirillum, and thermophile.
Cocci, bacilli, and spirilla are the names for spherical, rod-shaped, and spirally shaped bacteria, respectively.
What distinguishes methanogens from other organisms?Three characteristics are present in all methanogens. (1) They must manufacture methane since it provides them with all or the majority of the energy they need to grow. (2) They are archaea, a subclass of Euryarchaeota. (3) As strict anaerobes, they can only develop under anaerobic conditions.
Which of the following attributes best describes archaea?The following traits are shared by all archaebacteria that have been identified to date:
(1) the presence of distinctive tRNAs and ribosomal RNAs;
(2) the absence of peptidoglycan cell walls, which is frequently replaced by a coat that is largely composed of protein;
(3) the presence of ether linked lipids made from phytanyl chains.
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Each unit on the graph is equal to 1 block. How many blocks does Ben need to walk from his house to reach the museum?
A. 7 blocks
B. 9 blocks
C. 10 blocks
D. 13 blocks
Answer:
Explanation:
7 blocks