Which one of the following is least likely to cause mutations in DNA?
A) aflatoxins that are found in moldy grains
B) hydroxyl radicals formed as by-products of aerobic respiration
C) ultraviolet radiation from sunlight
D) light from an incandescent bulb
Answer: D
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Which of the following statements about DNA replication is false?
A. The two strands are separated. B. Each existing strand is used as a template for making a new strand. C. Synthesis of both new strands is in the 5' to 3' direction. D. The newly synthesized DNA is packaged into one nucleus, and the original DNA is packaged into another nucleus.
Which of the following features of DNA organization do eukaryotes and bacteria have in common (select all correct choices)?
A. DNA is associated with basic proteins. B. DNA is found within a 30 nm filament. C. DNA breakage in one loop will not affect DNA in other loops. D. A change of supercoiling in a cleaved loop would not affect other loops. E. Under electron microscope, DNA will have a beads-on-a-string appearance.
Amplification of a signal increases as the ____
a. number of enzyme-catalyzed steps increases b. number of enzyme-catalyzed steps decreases c. volume of the cell increases d. volume of the cell decreases e. rate of reaction of the rate-limiting reaction increases
In yeast chromosomes, centromeres
A) help distinguish one chromosome from another. B) are closely related in sequence. C) are only 10–15 bp long. D) contain satellite DNA.