UV light generates which of the following as a "signature" mutation in a gene?

A) DNA hydroxylation
B) a single-strand break
C) pyrimidine dimer formation
D) cross-links between DNA strands
E) changes in DNA methylation


Answer: C

Biology & Microbiology

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Trans fats

A) are unsaturated fatty acids. B) resemble saturated fatty acids in shape. C) are associated with an increased risk of heart disease. D) are present in small amounts in meat and dairy products. E) all of the above

Biology & Microbiology

Which plant is consumed by more people worldwide than any other crop?

a. wheat
b. corn
c. rice
d. potatoes
e. legumes

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Which has the greatest albedo? Grassland, forest, asphalt, or sea ice?

What will be an ideal response?

Biology & Microbiology

Chromatography is frequently used to purify proteins from cellular extracts. There are various strategies that can be used, depending on the tools and reagents available

You are interested in isolating additional proteins that interact with your protein target, but your labmates have used all the purified protein stocks. A. Why would you need purified target protein to do this experiment? B. What other strategies/tools could you use to carry out the affinity chromatography? C. What are the limitations to the method you described in part B that would not be a concern if you could use the purified protein directly?

Biology & Microbiology