What happens to a molecule when it is
phosphorylated?
a. it loses energy.
b. it receives a phosphate group.
c. it becomes denatured.
d. it loses electrons and protons.
e. more than one of these happen when a
molecule is phosphorylated
B
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A population of mountain goats are split because of the formation of a glacier. After 50 years the glacier melts and the population reunites. Hybrid zones may occur if
A. both pre-mating and post-mating isolating mechanisms occur. B. reproductive isolation is incomplete. C. a geographic barrier is removed after reproductive isolation is complete. D. both pre-mating and post-mating isolating mechanism occur and reproductive isolation is complete. E. both pre-mating and post-mating isolating mechanisms occur and a geographic barrier is removed after reproductive isolation is complete are correct.
Cancer cells ____
a. maintain telomerase function b. have longer telomeres than normal cells c. eventually die due to shortening chromosomes d. have circular chromosomes e. cannot replicate their DNA
Polyploidy is more common in plants than in animals. Why?
a. Animals reproduce sexually, plants do not. b. Many plants can either self-fertilize or reproduce asexually, or both, but animals cannot. c. Plants have more chromosomes than animals. d. Plants have shorter life spans than do animals. e. Animals are more complex than plants.
Which of the following is NOT a typical characteristic of most bacterial plasma membranes?
A) site of energy production B) composed of a phospholipid bilayer C) contains proteins D) contains cholesterol E) is selectively permeable