Synthesis of a repressible enzyme is inhibited by
A. substrate bound to repressor.
B. corepressor and repressor binding to operator.
C. repressor alone bound to operator.
D. substrate bound to promoter.
Answer: B
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The human b-globin gene has two alleles, HS and HA, individuals that are homozygous for HS have sickle-cell anemia and a lower fitness. Individuals that are heterozygotes (HSHA) do not show sickle-cell symptoms and have a resistance to malaria. Individuals that are homozygous for HA have the highest fitness but are susceptible to malaria. In areas where malaria is prevalent the HS allele is maintained in the population. Which type of selection is occurring with the b-globin gene?
A. directional B. disruptive C. stabilizing D. negative frequency dependent E. balanced
The small intestine releases the hormone secretin in response to acid.
Answer the following statement true (T) or false (F)
The health of the patient
A) is secondary to the health of the healthcare worker. B) is secondary to the health of co-workers in healthcare settings. C) should be the primary concern of the healthcare worker.
Large, flightless, long-necked birds
a. are native to three continents. b. inhabit flat, open grasslands. c. closely resemble each other in morphology and behavior. d. occur at about the same distance from the equator. e. fit all of these descriptions.