During this stage of mitosis, the nuclear envelope begins to break down and the spindle begins to form.

A. Metaphase
B. Prometaphase
C. Anaphase
D. Prophase
E. Telophase


Answer: D

Biology & Microbiology

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An organ must contain at least:

A. two different tissue types. B. two different cell types. C. all four of the tissue types. D. connective tissue. E. two different muscle types.

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If a toxin blocks the receptors for the neurotransmitter on the postsynaptic muscle cell,

____________________.

a. paralysis will occur b. the person will have a seizure c. the action potential in the presynaptic cell fails d. calcium, which can function as a neurotransmitter, will be released

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You recently identified a novel protein that contains several membrane-spanning domains. You would predict that the amino acids embedded in the membrane would have ________ side groups.

A. polar uncharged B. positively charged C. nonpolar D. negatively charged

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The protein required for the establishment and maintenance of lysogeny in cells infected with the temperate bacteriophage lambda is the ________.

A. lambda repressor B. lambda cos C. lac repressor D. lambda Xis and Int proteins

Biology & Microbiology