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1. The diagram below shows the DNA elements and associated factors that comprise the lac operon. Examine the diagram and answer the questions below
a) List all the elements in this piece of DNA that act in cis.
b) List all the elements in this piece of DNA that act in trans?
c) Where would the mutation occur in the IS situation? Would the IS mutation act in cis or in trans?
2. Epigenetic tags turn genes on or off in response to cell signals, creating a dynamic layer of control called the epigenome. Do you expect the epigenome of a kidney cell and a brain cell to be the same? Different? Explain. How about the epigenome of a newborn brain cell and the corresponding brain cell of their parent?
3. Comparative genome analyses reveal a surprising constancy in genetic content: vertebrate genomes have only about twice the number of genes that invertebrate genomes have, and the increase is primarily due to the duplication of existing genes rather than the invention of new ones. How, then, has evolutionary diversity arisen? Comment on these observations.
In drosophila the gene (vg) for vestigial wing is a recessivelocated at 67.0 units from the left end of the second chromosome.The gene (cn) for cinnabar eyes is also recessive and is located at57.0 units from the left end of the chromosome.
What is basics of epidemiology, brief description on Understanding basics of epidemiology
What are the criteria for "good" primers in a PCR reaction? Describe how you would use site-directed mutagenesis to change a BamHI restriction site into an EcoRI site.
Throughout exposure to elevated glucose, a yeast cell's membrane glucose transporters will rapidly increase so the cell can import glucose. Which will represent the yeast cell response.
Uric acid dissociates with a pKa of 5.80 and can be treated as a simple monoprotic acid in pH range. Its solubility in urine depends on relative amount of protonated and unprotonated forms.
List the organelles and structures found in cells. Pick one organelle and describe the role it plays in the life of the cell. In your description, comment on what may happen to the cell if the organelle did not function properly. Remember to cite ..
a. Write out the reaction equilibria for the sequential deprotonation of tyrosine and the equations for the corresponding Ka for each. (Hint: There should be three reaction equilibria.)
A solution containing 3.45 mM of p-xylene (analyte) and 6.86 mM of nonane (standard) gave peak areas of 13587 and 14769 respectively, in a chromatographic analysis. then 1.5 mL of 6.86mM nonane solution was added to 5 mL of an unknown sample conta..
In an experiment that tested the effect of light intensity on the rate of photosynthesis, we do not run a control tube in theexperimental setup. that is not every good scentific practice isit? why is a control important in an experiment?
the process of natural selection as defined by Darwin. How did Darwin's theories differ from his predecessors?
What type of promoters are found in the T-DNA that control oncogenes and opine synthesis genes? What is the basis for tumor formation in the Agrobacterium-plant? What causes the tumor to form? What products of the bacteria are needed to cause plan..
In the apoptosis pathway in C. elegans. What would be the difference in cell response between a cell that has a CED-9 mutation and a cell that has a CED-4 CED-9 double mutation? Explain why the difference is expected.
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