Membrane sterols, such as cholesterol, function in animal cell membranes to ____
a. increase the rate of diffusion
b. store cellular energy
c. facilitate ion transport
d. maintain membrane fluidity
e. receive chemical signals
ANSWER: d
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The rickettsias are divided into groups based loosely on
A) the types of clinical disease they produce. B) their insect vectors. C) taxonomy. D) their biochemical requirements.
The group that probably gave rise to chloroplasts is the
A. cyanobacteria. B. green photosynthetic bacteria. C. purple sulfur bacteria. D. non-sulfur purple bacteria. E. methane bacteria.
Fossils from Ethiopia indicate that modern humans had evolved by ________ years ago
a. 15,000 b. 85,000 c. 195,000 d. 950,000 e. 1.2 million
In eukaryotes, the 3? end of the mRNA is important in the initiation of translation because
A) it contains Kozak sequences that aid in initiation. B) translation occurs in the 3? to 5? direction. C) eIF4A is attached to the 3? end and removes any secondary structure that might prevent translation. D) the 3? poly(A) tail and PABP bind initiation factor eIF4G, stabilizing the 5? end of the mRNA. E) it contains Kozak sequences that aid in initiation of translation in the 3? to 5? direction.