The movement of alleles among populations is
called
a. a bottle neck.
b. mutation.
c. a founder effect.
d. gene flow.
e. genetic drift
D
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Which one of the following ribosomal subunits has three different pieces of rRNA in it?
A. 30S B. 40S C. 50S D. 60S
In the kidney, the specialized transport proteins that allow for very rapid fluid movement into or out of cells are known as
A) aquaporins. B) porins. C) ionophores. D) anion exchange proteins. E) osmosins.
In a cross involving plants with round/wrinkled
seeds, yellow/green pods, and tall/dwarf stems, the researcher is actually observing __________traits. a. 4 b. 3 c. 6 d. 12 e. none of these
Contrary to popular belief, stress is not usually the primary cause of ulcers, and many patients with ulcers do not over-produce acid. What Nobel prize-winning discovery demonstrated a previously unknown cause of ulcers?
A. the existence of a bacterial infection in the stomachs of most patients with ulcers B. genetically predetermined weakness in the walls of the intestinal tract C. the eroding effect of certain spicy foods on the lining of the esophagus D. greater acid concentrations in the stomach, lower esophagus, and duodenum