Which body plan is characterized by simple gas
exchange mechanisms, two-way traffic through a
highly branched, saclike gut, and a thin, flat body
with all cells fairly close to the gut?
a. cnidarian
b. nematode
c. echinoderm
d. flatworm
e. sponge
Answer: d
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Which experiment would best determine which genes are expressed in a Drosophila embryo?
A) analysis of a Drosophila genomic DNA library B) analysis of a cDNA library from adult male Drosophila C) analysis of a cDNA library from Drosophila embryos D) identifying all the open reading frames in the Drosophila genome E) identifying all the promoters in the Drosophila genome
When an object with blood on it touches one that does not have blood on it, this produces a(n)
A) contact pattern. B) flow. C) trail pattern. D) void.
In attenuation regulation of the trp operon, which stem loop forms when tryptophan is readily available to the cell?
A. 1:3 B. 2:4 C. 2:3 D. 3:4
Suppose that the pH of the matrix was significantly lower than the inner mitochondrial space. How would the ATP synthase function differently?
a. It would misfold. b. It would no longer function properly. c. It would require an ion to stabilize it. d. It would hydrolyze ATP to form ADP.