In mitosis, _____
a. the chromosome number is halved
b. the chromosome number is doubled
c. the chromosome number stays the same
d. the chromosome number may double or be halved depending on the species
e. gametes are formed
ANSWER: c
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Which of the following refers to the level of depolarization at which an action potential will be triggered?
A. resting potential B. membrane potential C. cationic potential D. refractory potential E. threshold potential
Evolutionarily, the jaws of vertebrates developed from
A. the circular mouth of lampreys. B. the last pharyngeal arch of jawless fishes. C. the third pharyngeal arch of jawless fishes. D. the operculum. E. the claspers.
The organelle responsible for radiant energy conversion to chemical energy is called the:
a. nucleus. b. chloroplasts. c. mitochondria. d. flagella. e. cytosol.
Why are stem cells important?
A) They have specialized DNA. B) They are incapable of becoming cancer cells. C) They have the potential to undergo cell division. D) They have the potential to develop into other cell types.