The carotid and aortic bodies stimulate respiratory activity ____
a. when oxygen levels in the blood fall relative to carbon dioxide
b. when carbon dioxide levels in the blood fall
c. when plasma pH becomes more basic
d. when the lungs are stretched beyond normal
e. during exercise
ANSWER: a
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The step of translation in which an mRNA, a small ribosomal subunit, and tRNA carrying methionine, are aligned together is
A. termination.
B. elongation.
C. initiation.
D. transcription.
E. mitosis.
Based on four generations of data, does the inheritance of this trait appear to be related to the sex of the offspring?
a. Yes b. No
A collective term for all plant tissues outside the vascular cambium is
A. wood. B. leaf. C. cork cambium. D. bark. E. mesophyll tissue.
If a gardener cuts the apical meristem of a plant, lateral buds begin to grow, which causes a bushier shape to develop. This is because the apical meristem normally secretes auxins that
A. suppresses the growth of lateral buds. B. suppresses the growth of the apical meristem. C. stimulates the growth of the apical meristem. D. stimulates the growth of lateral buds. E. stimulates the growth of roots.