Which of the following statements is not an accurate statement about thymine dimers?
(a) Thymine dimers can cause the DNA replication machinery to stall.
(b) Thymine dimers are covalent links between thymidines on opposite DNA strands.
(c) Prolonged exposure to sunlight causes thymine dimers to form.
(d) Repair proteins recognize thymine dimers as a distortion in the DNA backbone.
(b)
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What important feature(s) of noncovalent bonds makes them so important to life?
A. They are strong bonds that hold atoms together tightly in cells. B. They are weak in a cellular environment so they can be made, broken, and reformed easily. C. They can only occur in cells. D. Both a & c. E. Both b & c.
Fatty acids are metabolized by the ________ pathway.
A. delta-oxidation B. beta-oxidation C. alpha-oxidation D. gamma-oxidation
An unknown chemical is analyzed and found to contain the bases thymine and guanine. This chemical is most likely
A. mRNA. B. tRNA. C. DNA. D. rRNA.
Which of the following organelles most closely resembles a prokaryotic cell?
A) nucleus B) mitochondrion C) Golgi complex D) vacuole E) cell wall