What is NOT a major function of the cytoplasmic membrane?
a. protection from osmotic lysis
b. energy conservation and consumption
c. protein anchor
d. selective permeability barrier
Answer: A
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Gamma rays cause biological damage in living systems by
A. producing reactive molecules such as superoxide and hydroxyl-free radicals. B. causing tiny gravity sinks and black holes to be formed in the substance. C. introducing toxins. D. making the substance radioactive.
Which of the following NOT a protection from
most mutations?
a. very few bases actually change b. the genetic code is redundant c. most of our DNA is non-coding d. genes contain non-coding regions e. all of these protect us from mutations
In humans, where does fertilization occur?
A. in the vagina B. in the fallopian tubes C. externally D. in the ovary
In which phase of the cell cycle do cells check to determine whether the DNA is fully and correctly replicated?
(a) at the transition between G1 and S (b) when cells enter G0 (c) during M (d) at the end of G2