In Figure 41-3, point A is:
a. the resting state.
b. indicative of repolarization.
c. the threshold level.
d. the equilibrium potential.
e. indicative of hyperpolarization
C
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Which of the following mechanisms refer to when a bacteria assimilates genetic material (DNA) directly from the environment?
A. Transformation B. Transduction C. Conjugation D. All of the answers are correct
Which statement supports the theory that all organisms are related?
A) The genetic code is almost universal. B) All flies have two wings. C) Body parts with similar functions in different species are determined by unrelated genes. D) Prokaryotes have circular chromosomes.
What happens when an action potential arrives at an axon terminal?
a. Membrane voltages stimulate the axon. b. The action potential starts a chain reaction. c. A neurotransmitter builds up so it can be used again. d. The action potential causes an influx of phosphorous ions. e. Chemicals relay the message at a synapse.
Placing a ripe apple in a bag of green bananas will cause the bananas to ripen quickly. This is because the apple
A) absorbs cytokinin. B) forms digestive enzymes. C) releases heat. D) produces ethylene gas. E) makes auxin.