One key reason why viruses are not considered living organisms is
A. viruses do not contain genetic information.
B. viruses do not reproduce on their own.
C. viruses are all smaller than the smallest known cells.
D. viruses do not contain a nucleus.
E. viruses can be frozen and still survive.
B. viruses do not reproduce on their own.
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DNA polymerase assembles new strands in a ____
a. 5' to 3' direction only b. 5' to 3' direction building one strand and a 3' to 5' direction building the other stand c. 5' to 3' direction building the first half of a strand and a 3' to 5' direction building the second half of a strand d. 3' to 5' direction building the first half of a strand and a 5' to 3' direction building the second half of a strand e. 3' to 5' direction on the "old" 3' to 5' strand
You experimentally apply ?-bungarotoxin to a muscle and find that it does not contract when you electrically stimulate the motor neuron leading to it. You know that this toxin blocks acetylcholine receptors. Therefore, you suspect that the stimulation of contraction is failing at which of the following points?
A. A contraction fails to occur because acetylcholine is not released from the motor neuron. B. A contraction fails to occur because an action potential is not generated in the muscle cell. C. A contraction fails to occur because this toxin directly prevents calcium ion release from intracellular stores. D. A contraction fails to occur because neurotransmitter release by the motor neuron is blocked at the neuromuscular junction. E. A contraction fails to occur because this toxin prevents cross-bridge formation and thereby directly prevents contraction.
Isomers are two or more molecules with ____ chemical formula and ____ molecular structures
a. a different; different b. the same; different c. a different; the same d. the same; the same e. a structural; theoretical
The extracellular fluid is ____
a. the body’s internal environment b. mostly plasma c. comprised of about 4 liters of fluid d. found inside the cell e. is found inside cells and blood vessels