A germ cell is indicated by the letter(s) ____
a. A
b. B
c. C
d. D
e. B, C, and D
ANSWER: a
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Which of the following is nota mechanism for regulating gene expression before the mature RNA transcript is produced?
A. mRNA splicing B. protein degradation C. attenuation of transcription elongation D. modification of mRNA termini
In an annual tree ring, the wood with large diameter, thin-walled cells is ____
a. called early wood b. heartwood
c. formed from crushed phloem cells d. produced in the winter e. called late wood
In some animals, such as the marsh wren, one male bird mates with several females. This is known as:
a. polygyny. b. polyandry. c. monogamy
d. a dominance hierarchy. e. codominance.
In the black bread mold, zygospore production begins with development of hyphal branches whose cytoplasm is isolated from the rest of the mycelium by cross walls. These structures are known as
a. asci b. basidia c. gametangia d. conidia e. sporangia