How does the nucleotide excision repair (NER) system in E. coli work, and what kinds of DNA damage does it repair?
What will be an ideal response?
The NER system repairs thymine dimers and other serious distortions of the DNA helix. It is a system of four proteins (UvrA, UvrB, UvrC, and UvrD) that work in a complex to recognize a distortion in the DNA, make cuts on either side of the lesion, release the short single-stranded cut segment, and allow DNA polymerase and ligase to fill in the gap with new bases.
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Why are the words "about" and "approximately" used in discussing the results of genomic analysis? Predict what advances in knowledge or methods could change our understanding of a genome sequence
What will be an ideal response?
The small, non-protein molecules that can be readily separated from an enzyme and are responsible for transfer of atoms from one molecule to another are referred to as
A. vitamins. B. enzymes. C. hormones. D. coenzymes.
Blood vessels are made of:
a. mesenchymal cells b. endothelial cells
Which situation would represent a trade-off between survival and reproduction?
A. The production of many offspring results in smaller offspring. B. Mating activity and egg production reduce the longevity of both sexes. C. All listed D. Human parents have less sleep and higher rates of disease infection than nonreproductive individuals. E. Survival to greater age comes at the expense of early reproduction.