Which of the following events occurs over the

longest period of time in humans?
a. blastula formation
b. cleavage
c. fertilization
d. gastrulation
e. growth and tissue specialization


Answer: e

Biology & Microbiology

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Which of the following regions of the human brain is critically important for controlling heart rate and breathing?

A. medulla oblongata B. cerebellum C. thalamus D. hippocampus E. cerebral cortex

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If a dividing cell had no functional Cdk2 protein, the cell would not be able to ____

a. phosphorylate cyclins b. transcribe the Cdk2 gene c. enter G1 d. translate cyclin mRNA e. degrade cyclins

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The adaptation that allows insects to blend into the background might be represented by:

A. the grass in a yard. B. the color of a building. C. the instar of grasshoppers. D. the leaves on a tree. E. tinted windows in a car.

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Refer to the accompanying figure. In which part of the muscle fiber are calcium ions stored?

a. 2 b. 3 c. 4 d. 5 e. 6

Biology & Microbiology