Why doesn't nonrandom mating directly change allele frequencies and is thus not, a mechanism of evolution? However, nonrandom mating does influence genotype frequencies. Can someone explain this in more depth?
In: Biology
In: Biology
why different alcohol yield different reults for membrane dissolution?
why we use buffer, ethanol, SDS in DNA and Protien experiements?
In: Biology
In paragraph form, explain how photosynthesis is an oxidation/reduction reaction in detail. (A) What is the chemical formula showing the reactants and the products? (B) What is oxidized and what is reduced? (C) In your answer, you must explain the relationship between oxidation/reduction and the position of shared electrons in chemical bonds--Which bonds have more potential energy, and why? (D) Is photosynthesis anabolic or catabolic? (E) Is photosynthesis exergonic or endergonic--explain why?
In: Biology
In paragraph form, explain how an electrochemical gradient is generated and how it is used to synthesize ATP in the mitochondrion during cellular respiration. In your answer you should discuss (A) which structures/enzymes/proteins and major electron donors/acceptors are involved, (B) where it happens, and (C) what all of the inputs and outputs are. (D) Your answer should discuss potential and kinetic energy in this process. Finally, (E) what would happen to this process if oxygen became unavailable, and why?
In: Biology
Compare channel and carrier transport proteins.
In: Biology
a) You have an exponentially-growing population of rodents, with an annual λ of 1.35.
Calculate the number of individuals added to the population in a given month when there are 250, 500, 1000, 5000, or 10,000 individuals to start with. (2pts)
b) Now impose density dependence on the population with a logistic model in which K = 6500 individuals. Again, calculate the number of individuals added to the population in a given month when there are 250, 500, 1000, 5000, and 10,000 individuals to start with. (2pts)
c) How does population growth compare between the two models (exponential vs. logistic) at the low and at the high starting population numbers? (2pts)
Present the numbers (rounded to two decimal places) for a), and b) in a table in the space below, along with the answer for c).
In: Biology
In: Biology
1a. List and describe 3 types of epigenetic inheritance.
1b. Describe the process of translation termination.
1c.What are the 3 main differences in how bacteria undergo translation?
In: Biology
1. What are secreted proteoglycans found in the extracellular matrix?
| a. | they are proteins covalently linked to any polysaccharides |
| b. | they are proteins covalently linked to fibronectin fibrils |
| c. | they are proteins covalently linked to any oligosaccharides |
| d. | they are proteins covalently linked to collagen fibrils |
| e. | they are proteins covalently linked to glycosaminoglycans |
2. Which of the following signaling molecule is first produced upon activation of olfactory receptor neurons to mediate "smell"?
| a. DAG |
| b. cAMP |
| c. IP3 |
| d. cGMP |
| e. PIP3 |
In: Biology
1. Which of the following transcription factor complexes is activated by Jak upon interferon (cytokine) activation?
| a. | NF-kB |
| b. | Smads |
| c. | STATs |
| d. | c-Jun |
| e. |
CREB 2. Interactions between intracellular signaling proteins are mediated by modular binding domains. Which of the following domain binds to a proline rich region?
|
In: Biology
The experiment is about whether the concentration of sodium bicarbonate will have an effect or not on the rate of photosynthesis in spinach by recording the time taken by the leaf disks to float in the sodium bicarbonate solution with different concentrations (0.7% and 1.5%) as treatment groups and the distilled water as the control group.
Is it possible for leaf disks to float in thecontrol group (Distilled water)?
Why do you think the leaf disks floated at different times in your trial run?
What are the potential sources of error? How will you troubleshoot these when running your experiment?
On what basis will you determine the number of replicates to be used?
In: Biology
In: Biology
True or False? If false, explain why.
a) The ribosome moves along the mRNA in a 5’ à 3’ direction
b) The overall structure of the ribozyme is dictated by rRNA
c) Ribosomes consist of 2/3 protein and 1/3 rRNA
d) Each ribosome has 1 large subunit and one small subunit
e) The small ribosomal subunit is the first to bind to the mRNA via the 5’ cap
f) RNA polymerase II is responsible for transcribing messenger RNA •
g) Combinatorial control of gene expression involves groups of transcriptional regulators working together to determine the expression of a gene
h) A nonsense mutation is a type of base pair substitution that leads to a change from one amino acid to a different amino acid.
In: Biology