In which stage of labor dose the amniotic sac rupture?
a. the first stage only
b. the second stage only
c. the third stage only
d. in either the first or second stage
e. in either the second or third stage
ANSWER: a
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Auxin concentration gradients
a. appear once germination begins. b. promote the transcription of an enzyme that breaks down cytokinin. c. allow formation of plant parts in expected patterns. d. help young cells elongate so that shoots and roots lengthen. e. are described by all of these EXCEPT "appear once germination begins."
The metal atom bound to the heme group of hemoglobin is
A. sodium. B. copper. C. zinc. D. iron. E. manganese.
When a vesicle moves along microtubules toward the center of the cell, the molecular motor(s) ________ are used?
A. kinesin B. Molecular motors are not required for movement along microtubules. C. both kinesin and dynein D. dynein
What causes the rhythmic change in cyclin concentration in the cell cycle?
A) The cascade of increased production once the protein is phosphorylated by Cdk B) An increase in production of a Cdk once the restriction point is passed C) Its destruction by an enzyme phosphorylated by the cyclin-Cdk complex D) The binding of PDGF to receptors on the cell surface E) The changing ratio of cytoplasm to genome