They occur slowly over long periods of time because of influence of environment.
What is natural selection?Natural selection is the process that shows survival and changes occur inspecies over time. The physical traits, sensory abilities, or behaviors enhance the survival of a species which can be adapted by the organisms for their survival.
So we can conclude that it occur slowly over long periods of time because of influence of environment.
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Which of the following occurs when a molecule fits into the binding site of a receptor protein on a cell’s surface?
When a signal molecule binds a membrane receptor, different intracellular events occur in response. Option D is correct: All of the above.
What is signals translation and how is it done?Signal translation is the conversion global process of extracellular signals into intracellular responses. This porcess is done by a translator.
Translation might be
INDIRECT ⇒ Second messengers participate in the signal translation, mediating between receptor and the cellular response.
The receptor-ligand union causes the production of second messengers that will activate effector proteins. Occurs an amplification of the signal.
DIRECT ⇒ Occurs directly in the membrane.
Ionic channel proteins are activated and can change the chemical signal into an electric signal through ion flow.
When the molecule binds receptors that are associated with enzymes -or acting as enzymes- or to G proteins, it occurs a conformational change in the receptor cytoplasmic domain.
This change triggers an intracellular signal cascade in which many molecules participate and several chemical changes occur.
According to this framework, all the options are correct,
The receptor can open an ion channel in the cell membrane.The receptor can act as an enzyme causing chemical changes in the cytoplasm.The receptor can cause the formation of a second messenger.So te correct option is Option D. All of the above.
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What are the functions of the pectoral girdle?
Answer:
Your pectoral girdles are responsible for providing structural support to your shoulder region on the left and right side of your body. They also allow for a large range of motion, connecting muscles necessary for shoulder and arm movement. The pectoral girdles on either side of your body aren't joined together.
Which of the following statements about secondary succession is true?
Answer:
A
Explanation:
A. Secondary succession occurs in ecosystem that have no vegetation.
What is secondary succession?
"Secondary succession, type of ecological succession (the evolution of a biological community's ecological structure) in which plants and animals recolonize a habitat after a major disturbance—such as a devastating flood, wildfire, landslide, lava flow, or human activity."
What are the stages of secondary succession?
The stages that lead to secondary succession include:
Growth exists.Existing growth is destroyed.Destruction stops. The soil remains.Time goes by.Regrowth begins.Fast-growing plants and/or trees are dominant for a while.Slower growing plants and/or trees come back and begin growing.Eventually, the area is fully populated with plant life again, though it may be more diverse or otherwise different than it was prior to being destroyed.What is an ecosystem?
"An ecosystem is a geographic area where plants, animals, and other organisms, as well as weather and landscape, work together to form a bubble of life."
What is a vegetation?
"Vegetation is defined as growing plants, or a life without physical, mental or social activity."
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Help please thank you due today
Answer:
D: The trait of agouti fur is dominant over the trait of black fur.
Explanation:
A is not true because you can clearly see that there is a chance for the offspring to have black fur.
B is false because there is a 50% chance for the offspring to have agouti fur and 50% for black fur. If the trend keeps going, not all the mice would end up with black fur.
C can't be the answer because that just makes no sense. If you don't like my reasoning, neither do I. It just doesn't feel right.
Which of the following descriptions of differences between eukaryotes and prokaryotes is NOT CORRECT? Group of answer choices Eukaryotes have ester-linked phospholipids, whereas prokaryotes have ether-linked or ester-linked phospholipids. Eukaryotic cell walls lack peptidoglycan in their cell walls (if present), whereas many prokaryotes use peptidoglycan in their cell walls. Eukaryotic cells have histones for DNA organization, whereas prokaryotic cells have histone-like proteins or nucleoid-associated proteins involved in DNA organization. Eukaryotic cells typically have circular chromosomes, whereas prokaryotic cells typically have linear chromosomes.
Answer:
Eukaryotic cells typically have circular chromosomes, whereas prokaryotic cells typically have linear chromosomes.
Explanation:
Prokaryotic and Eukaryotic cells are the two kinds of cells that living organisms are composed of. Eukaryotic cells are cells that possess a membrane-bound nucleus while prokaryotic cells do not possess a membrane-bound nucleus. The cell membrane of eukaryotes contain ester-linked phospholipids, whereas that of prokaryotes (bacteria and archeae) have ether-linked or ester-linked phospholipids.
Peptidoglycan is the major constituent of the cell wall of many prokaryotes (bacteria) while peptidoglycan is absent in the cell wall of eukaryotes that possess it. One notable difference between eukaryotic and prokaryotic cells is the SHAPE OF THEIR CHROMOSOME.
- The chromosome in eukaryotic cells is LINEAR while that in prokaryotic cells is CIRCULAR in shape.
A species is transported to a new ecosystem. The new ecosystem is highly resilient, with a high number of different species. Which is MOST likely to happen to the new species?
It cannot compete with native species and dies off.
It successfully competes with the native species and becomes part of the food web.
It successfully competes with native species and becomes a native species itself.
It is more successful than the native species and becomes an invasive species.
Answer:
It cannot compete with native species and dies off.
Explanation:
Jason wanted to find out how he could increase the number of popcorn kernels that pop when cooked. He hypothesized that more kernels would pop if he used more oil. To test this, he placed 100 kernels of “Pop Rite’ popcorn into a popcorn popper that contained different amounts of oil. He used the following amounts of oil: 5 ml, 10 ml, 20 ml, and 30ml. 5mL is the amount of oil suggested on the popcorn box. He conducted the test 3 times for each amount of oil. He then counted the number of kernels that had popped. Each time he heated the oil for 2 minutes and cooked the popcorn for 4 minutes.
What is the control?
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Answer:
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In the absence of carbon dioxide in its environment, the plant will
a. be able to use alternate pathways to produce carbohydrates
b. be able to use water vapor to drive the second half of photosynthesis
c. be unable to produce glucose in the Calvin cycle without CO2.
d. be unable to open the stomata and therefor will do no photosynthesis
Answer:
Be unable to open the stomato and therefore will do no photosynthesis
13) Which best explains why muscle cells are different from blood cells? (1.1.3)
A mutation occurs during the development of muscle cells but not in blood cells,
b. Different genes are activated in muscle cells than in blood cells.
c. Muscle cells experience different environmental influences than blood cells,
d. Muscle cells are produced by the brain, but blood cells are produced by the heart,
Answer:
B.Different genes are activated in muscle cells than in blood cells.
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Describe why populations increase and decrease.
Answer:
There are three components of change: births, deaths, and migration. The change in the population from births and deaths is often combined and referred to as natural increase or natural change. Populations grow or shrink depending on if they gain people faster than they lose them.
Explanation:
Why pollen is important in fertilization?
Answer:
pollen is important in fertilization because pollen carries male gamete and it helps in transportation of male gamete during fertilization in mainly gymnosperms and angiosperms.
Two frog populations (same species) living in two neighboring lakes sing slightly different courtship songs. Increased irrigation makes the land between the two lakes wetter, allowing frogs to expand their ranges to the area between the lakes. Females in both populations prefer loud frogs to quieter frogs but do not distinguish between the two slightly different songs. Assuming that courtship song differences are due in part to genetic differences, predict what will likely happen to the songs of the two frog populations.
a. The gene flow between hatchery-reared and wild populations is leading to a decline in fitness of wild populations.
b. The gene flow between hatchery-reared and wild populations is neither helping nor hindering the fitness of the wild population.
c. This data does not help us understand effects of gene flow on fitness. The gene flow between hatchery-reared and wild populations is increasing the fitness of the wild populations.
d. You cannot predict a change in the courtship songs at the two lakes.
Answer:
I am pretty sure that the answer is B or D
Explanation:
a decline in fitness doesn't really make sense, because we are talking about courtship songs, not health. C.) doesn't make sense either, because at the end of the sentence it says that the fitness of the population is growing. again, we are talking about songs. Both b and d make sense.
How does propagation occur in DNA and RNA?
Answer:
Life on earth is very diverse, from single-celled protozoans to complex multicellular plants and animals. But at the molecular level, all life is fundamentally made up of the same building blocks – DNA and RNA. One of the primary differences between DNA and RNA is that DNA is double-stranded while RNA is single-stranded.
The simulation also provides data for many other Everglades species which of these results would provide the strongest evidence that would alligator is a key species
Answer:
keystone species in the Everglades. The graph shows the population of aligators in one of the computer simulations
Population of
Alligators (Simulation)
Percentage of Population
compared to Year 0
0
4
12
16
8
Year
The simulation also provides data for many other Everglades species. Which of these results would provide the strongest evidence that the
aligator is a keystone species?
Explanation:
answer
In_the organism hunting is called the _.organism being hunted is called the The_
Answer:
Ecosystems; carnivores; prey
Explanation:
In ecosystems, the organism hunting are called carnivores. Organisms that are being hunted are called the prey.
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A 15-yr-old girl had a seizure this morning and was rushed to the hospital. On examination, her temperature is 40C and she had no nuchal rigidity. CT scan revealed no abnormality. A spinal tap was done and the protein and glucose were normal. Gram stain of the CSF showed no organisms and no PMNs. SHe was treated with various antibiotics but became comatose and died 2 days later. The routine blood culture and spinal fluid grew no organism. On autopsy of the brain, eosinophilic inclusion bodies were seen in the cytoplasm of neurons. Which of the following is the MOST likely cause?
a. Prions
b. JC virus
c. Rabies virus
d. Parvovirus B19
e. Herpes simplex virus type 1
Answer:
Rabies Virus
Explanation:
Question 7 of 10
Which best defines matter?
O A. All the living things on the planet
B. All solid objects that can be seen
O C. Anything in the atmosphere
O D. Anything that takes up space and has mass
Answer:
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Which best defines matter?
A. All the living things on the planet
B. All solid objects that can be seen
C. Anything in the atmosphere
D. Anything that takes up space and has mass
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D. Anything that takes of space and has mass
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The organism shown above belongs to
Answer:
The biological classification's hierarchy involves eight important taxonomic ranks. They are written below in decreasing order: Life > Domain > Kingdom > Phylum > Class > Order > Family > Genus > Species.
The U.S and Canada have historically used a six-kingdom scheme in their traditional textbook, such as Plantae, Animalia, Protista, Fungi, Archaea / Archaebacteria, and Bacteria / Eubacteria. The given image depicts snake which come under "Animalia Kingdom", carnivorous reptiles to suborder.
What would the respiratory system NOT be able to do without the circulatory system?
A The respiratory system would not be able to exchange gases.
B
The respiratory system would not be able to assist with movement.
C. The respiratory system would not be able to send signals throughout the body.
D. The respiratory system would not be able to transport nutrients throughout the body.
Answer:
The correct answer is D. The respiratory system would not be able to transport nutrients throughout the body
The main function of the circulatory system is to provide oxygen, nutrients and hormones to muscles, tissues and organs throughout your body.
The circulatory system and respiratory system work together to support the body
The answer pls quick
Answer: DNA replication needs to occur because existing cells divide to produce new cells. So the DNA needs to be copied before cell division so that each new cell receives a full set of instructions.
Explanation:
During cell division, a cell must replicate its DNA, and if there are errors Before a cell can divide, many processes must occur, including the proper Mitosis is the phase when the cell actually divides into two cells, known as daughter cells. giving replication enzymes access to create a new copy of each chromosome.
how is mRNA are rRNA and TRNA related to their functions??
mRNA rRNA and tRNA are all different forms of RNA. mRNA is one that, with the help of the antisense strand copies the nitrogen bases in RNA form (replacing T with U). The tRNA then connects to three codons and forms a polypeptide chain in the cytoplasm.
8.Which particle as the same mass as a neutron?
Answer:
proton
Explanation:
no charge, it weighs 1 amu
The Muana Loa site in Hawaii has been monitoring which greenhouse gas since the 1950s?
A. carbon dioxide
B. methane
C. nitrous oxide
D. water vapor
Carbondioxide gas has been monitored at Muana Loa site in Hawaii.
What gas is monitored by Mauna Loa site in Hawaii?Mauna Loa is considered as the oldest continuous carbon dioxide (CO2) measurement station in the world. This station performs monitoring of the this gas which is responsible for heat-trapping in the atmosphere leads to global warming.
In conclusion, Carbondioxide gas has been monitored at Muana Loa site in Hawaii.
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Explain why you can see the Moon.
Science
Answer:We see the Moon because sunlight reflects back to us from its surface. During the course of a month, the Moon circles once around the Earth. If we could magically look down on our solar system, we would see that the half of the Moon facing the Sun is always lit. But the lit side does not always face the Earth. As the Moon circles the Earth, the amount of the lit side we see changes. These changes are known as the phases of the Moon and it repeats in a certain way over and over.
Explanation:
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Darwin said “It is not the strongest of the species that survives, nor the most intelligent,
but the one most responsive to change.” Explain what Darwin meant by this.
Answer:
darwin means that the species that are able to adapt are the ones that survive not because they are strong or smart but because they can adapt to changes in their enviroment
Explanation:
Which of the following is true about the Calvin cycle?
Rubisco fixes O2 to a carbohydrate molecule.
Both ATP and NADPH are needed to make sugars.
Light energy is converted to chemical energy.
Answer:
The second answer is correct
In order for P. multocida to survive and carry out cellular functions (and cause infection), the energy contained in each molecule of glucose must be converted into ATP. This occurs via the process of chemiosmosis, which couples electron transport to ATP synthesis. This process involves the sequential transfer of elections via a series of protein complexes and carriers found in the bacterial plasma membrane. Recall that electrons move down the chain in a sequential fashion due to the increasing electronegativity of the components of the electron transport chain.
Arrange the components of the electron transport chain in order from least electronegative.
a. O2
b. NADH dehydrogenase
c. Cytochrome b-c1 complex
d. Coenzyme Q
e. Cytochrome c
f. Cytochrome oxidase complex
Answer:
Components of the electron transport chain (ordered by electronegativity from least electronegative to most electronegative):
NADH dehydrogenase >> Coenzyme Q >> Cytochrome b-c1 complex >> Cytochrome c >> Cytochrome oxidase complex > O2
Explanation:
The electron transport chain transfers electrons from donors to acceptors via redox reactions (i.e., where reduction and oxidation occur together), and couples the transfer of electrons with proton transfer (H+ ions) across the membrane. In the electron transport chain, the electrons are transferred from NADH dehydrogenase NADH to oxygen (O2) through a series of transmembrane complexes: NADH-Q oxidoreductase, Q-cytochrome c oxidoreductase and cytochrome c oxidase. In the first place, the reduced form of coenzyme Q (ubiquinone) transports the electrons from the NADH-Q oxidoreductase to the Q-cytochrome c oxidoreductase complex (Cytochrome b-c1 complex). Second, the cytochrome c transports the electrons from this complex (i.e., Cytochrome b-c1 complex) to the Cytochrome oxidase complex, this being the last component in the electron transport chain that is responsible to catalyze the reduction of O2.
The function of the beta subunit is to prevent DNA polymerase III from dissociating from the template DNA strand while still allowing the polymerase to slide along DNA as replication progresses. Given this function, the alpha helices in the beta subunit are The function of the beta subunit is to prevent DNA polymerase III from dissociating from the template DNA strand while still allowing the polymerase to slide along DNA as replication progresses. Given this function, the alpha helices in the beta subunit are:
a. located on the inner surface and oriented perpendicular to the minor and major grooves of DNA.
b. located on the inner surface and oriented parallel to the minor and major grooves of DNA.
c. located on the outer surface and do not interact with DNA.
Answer:
a. located on the inner surface and oriented perpendicular to the minor and major grooves of DNA.
Explanation:
The beta subunit of the Polymerase III is a ring-shaped clamp that embraces DNA in a central 35-angstrom (A) hole and plays an important role in the processivity of the enzyme during DNA replication. The beta subunit of the Polymerase III is a homodimer composed of two monomers (each of 366 amino acids), where each monomer provides one half of the ring-shaped clamp. In the beta dimer, this hole is sufficiently large to accommodate the double helix of DNA.
A wildflower native to California, the dwarf lupin (Lupinus nanus) normally bears blue flowers. Occasionally, plants with pink flowers are observed in wild populations. Flower color is controlled at a single locus, with the pink allele completely recessive to the blue allele. Harding (1970) counted several lupin populations in the California Coast Ranges. In one population of lupins at Spanish Flat, California, he found 25 pink flowers and 3291 blue flowers, for a total of 3316 flowers. Calculate the expected allele frequencies and genotype frequencies if the population were in Hardy-Weinberg equilibrium.
Answer:
- Allele frequencies >> pink allele (b)= 0.0868 and blue allele (B) = 0.913
-Genotype frequencies >> bb = 0.00754; BB = 0.834 and Bb = 0.158
Explanation:
B: blue allele >>> p = frequency (B)
b: pink allele >>> q = frequency (b)
According to the Hardy-Weinberg equilibrium:
- The frequency of the bb genotype (q2) is equal to 25/3316 = 0.00754
Consequently, the frequency of the recessive pink allele (b) is equal to q = √(0.00754) = 0.0868
- The frequency of the dominant blue allele (B) is equal to p = 1 - q = 1 - 0.0868 = 0.913
- The frequency of the BB genotype (p²) is equal to (0.913)² = 0.834
- The frequency of the Bb genotype (2pq) is equal to 2 x 0.913 x 0.0868 = 0.158