Differential RNA processing may result in:
A. a shift in the ratio of mRNA produced from two adjacent genes.
B. inversion of certain exons in the mature mRNA.
C. the production of the same protein from two different genes.
D. the production of two proteins with different activities from a single gene.
D
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The wing of a bat, the flipper of a whale, and the arm of a human have a similar structure and all can trace their lineage back to a common ancestor. This would be an example of which of the following?
a. a homologous structure b. a vestigial structure c. an analogous structure d. none of the above
Sensory nerves communicate the strength of a stimulus by
a. the magnitude of the voltage change across the membrane during the action potential. b. the speed at which the action potentials are transmitted down the axon. c. the number of action potentials transmitted down the axon. d. a and b. e. a and c.
The structure labeled "F" is the ____
a. right ventricle b. left atrium c. left ventricle d. right atrium e. superior vena cava
The fist four-legged vertebrates were
A. amphibians. B. reptiles. C. tortoises. D. lampreys. E. lungfish.