Which of the following traits is not characteristic of amphibians?
a. carnivorous as adults
b. four-chambered heart
c. needing water to breed
d. evolved from lobe-finned fish
b
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The enzyme that has the ability to synthesize DNA from ribonucleic acid (RNA) is called:
a. DNA polymerase. b. RNAse. c. helicase. d. reverse transcriptase.
The cell junction labeled "B" in the figure
a. prevents movement of materials between cells. b. allows passage of a signal to contract heart muscles. c. allows the free passage of materials between cells. d. is found mostly in stomach tissue. e. is found in most tissues except heart muscle.
Which of the following most accurately
describes the cellular activity associated with the actual passage of a nerve impulse? a. electrical discharge b. action of sodium-potassium pump c. positive feedback d. hyperpolarization followed by rebalancing e. active transport of ions
Small, nonterritorial male marine iguanas typically have their mating interrupted by larger males prior to ejaculation. What alternative mating strategy have these small males developed to compensate for this?
A) Small males form coalitions and distract larger males to allow enough time for copulation. B) Small males induce ejaculation prior to copulation, and store the ejaculate in their cloacal pouches. C) Small males have developed the ability to induce ejaculation much more quickly than large males. D) Small males have developed sperm that are more efficient at fertilization than the sperm of larger males.