Genetic regulation in bacteria can involve alterations in RNA secondary structure. What phenomenon occurs in the trp operon that involves such alterations?
A) transcription
B) intron processing
C) attenuation
D) polyadenylation of the 3? end of the mRNAs
E) capping
Answer: C
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In the early 1900s, many people, particularly in the southern U.S., suffered from infections
with parasitic hookworms. Many of these hookworms feed on blood cells of the host and thus also consume iron that is found in red blood cells. A symptom of a heavy infection is a craving to eat dirt—particularly clay-like soils with a high iron content. Thus, for these people, iron is a __________.
a. tradeoff b. constraint c. part of the organism’s niche d. nonlimiting resource
Nitrogen fixation is carried out by:
a. nitrifying bacteria. b. prochlorophytes. c. cyanobacteria. d. all heterotrophic bacteria. e. only spirilli-shaped bacteria.
Pairs of maternal and paternal chromosomes line up between the two spindle poles during
a. metaphase I. b. telophase I. c. prophase II. d. metaphase II. e. anaphase II.
A population that has experienced a genetic bottleneck and lost its genetic variability can never again attain substantial numbers.
a. true b. false