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
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A mammalian female’s
a. cells usually have multiple Barr bodies. b. body is a mosaic for the X-linked traits she inherits. c. Barr bodies are active in some cells. d. Barr bodies are produced after puberty. e. X-linked recessive genes are always expressed because of the deactivation of an X chromosome in each cell.
The need for larger and more frequent doses of a drug is called
a. addiction. b. habituation. c. psychological dependence. d. synergism. e. tolerance.
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
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