The enzyme reverse transcriptase
A) synthesizes DNA to repair gaps in a DNA strand.
B) synthesizes DNA from an RNA template.
C) synthesizes RNA from an RNA template.
D) synthesizes RNA from a DNA template.
E) can synthesize DNA or RNA from an RNA template.
B
Bloom's Taxonomy: Knowledge
Section: The Role of Recombinant DNA Technology in Biotechnology
Learning Outcome: 8.5
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What happens to a cell that is placed in a hypertonic solution?
a. The cell swells. b. The cell shrinks. c. The cells stays the same size. d. The cell will lyse.
Which of the following occurs first during an action potential?
a. Many sodium ions flow into the neuron. b. Voltage-gated sodium channels open. c. A local disturbance triggers the resting voltage to exceed the threshold level. d. The interior of the neuron becomes positive. e. The interior of the neuron becomes negative.
The role of the postsynaptic neuron in neural communication is to ____
a. release neurotransmitters b. use gated calcium channels c. contain synaptic vesicles d. block the action of neurotransmitters e. receive the signal from the presynaptic cell
The amino acid sequences in cytochrome c were determined for chickens, ducks, and humans. Scientists found a difference of 3 amino acids between chickens and ducks, and 13 differences between chickens and humans. Based on this information, one can conclude that
A. chickens are more closely related to ducks than they are to humans. B. chickens are more closely related to humans than they are ducks. C. ducks are more closely related to humans than they are to chickens. D. chickens are as closely related to humans as they are to ducks.