A condition in which a diploid organism has different allelic forms of a particular gene is the definition of
A. homozygous.
B. phenotype.
C. genotype.
D. heterozygous.
D. heterozygous.
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You get the latest strain of the flu virus. How will your cytotoxic T cells respond?
A. They will secrete antigens. B. They will directly destroy the virus. C. They will secrete antibodies. D. They will destroy infected host cells. E. They will destroy all host cells.
A normal heartbeat is not set or initiated by the nervous system, which may be expected since the heart has electrical activity. If not the nervous system, then what actually regulates or initiates a normal heartbeat?
What will be an ideal response?
Which of the following is (are) an effect(s) of auxin?
A. Trees sprayed with auxin will keep mature fruit from falling to the ground. B. Applied to a woody cutting, auxin causes roots to develop. C. Under the effect of gravity, auxin moves to the lower surface of roots and stems, causing roots to curve downward and stems to curve upward. D. Auxin production by seeds promotes the growth of fruit. E. All of the choices are effects of auxin.
The following statements are true about some cyanobacterial species except:
A. gave rise to chloroplasts. B. can partner with fungi in a symbiotic relationship. C. can fix nitrogen. D. form filaments in water. E. do not perform photosynthesis.