DNA methylation is the only known natural modification of DNA. It affects
A. cytosine bases.
B. thymine bases.
C. guanine bases.
D. adenine bases.
Answer: A
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An evil genius wants to stop all vascular plants from photosynthesizing. He decides to send his minions out to cut off the structures in plants where most photosynthesis takes place. Which structures should his minions remove?
A. roots B. flowers C. leaves D. stems
Which of the following statements about plant tissue culture is false?
A. Virus-free crop species can be propagated by culturing meristems. B. Individual cells can give rise to whole plants through tissue cultures. C. Synthetic hormones can be used to selectively promote root or shoot formation. D. Callus tissue can only form roots, not shoots. E. A callus is a mass of undifferentiated cells.
Outline the various ways in which chromosomes can regulate how much of an enzyme is present at
any given time within a eukaryotic cell. What will be an ideal response?
All of the following are risks associated with the development of colon cancer EXCEPT which one?
A) low-fiber diet B) obesity C) family history D) consumption of vitamins A, C, and E E) smoking