The increase in girth (width) of trees occurs as a consequence of which of the following?

a) primary growth
b) growth from cambium tissues
c) sexual reproduction
d) growth in apical meristems
e) increase in width of sieve tubes


Answer: b) growth from cambium tissues

Biology & Microbiology

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The need for larger and more frequent doses of a drug is called

a. addiction. b. habituation. c. psychological dependence. d. synergism. e. tolerance.

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Interferons beta and alpha are released from ________ and act to inhibit viral replication by ________.

A) phagocytotic cells : degrading RNA B) infected cells : degrading RNA C) T lymphocytes : degrading RNA D) neutrophils : digesting the virus E) phagocytotic cells : digesting the virus

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An activator is to an enhancer as a(n) ________ is to a silencer.

A. repressor B. transcription factor C. mediator D. inducer E. RNA polymerase II

Biology & Microbiology