Which of the following statements DOES NOT characterize decomposers?
A. They feed on nonliving organic matter.
B. They are saprobes.
C. They break down wastes.
D. They release nutrients that other organisms can use.
E. They contain endosymbionts.
E. They contain endosymbionts.
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The tube feet of a sea star
(a) bear tiny toes. (b) are located only at the tips of the arms. (c) function in movement. (d) protect the organism from predatory fish.
When experimentally applying alpha-bungarotoxin to a muscle, you find that it does not contract when the motor neuron leading to it is electrically stimulated. Knowing that this toxin blocks acetylcholine receptors, what can you conclude about the failure to contract?
A. A contraction fails to occur because an action potential is not generated in the muscle cell. B. A contraction fails to occur because this toxin prevents cross-bridge formation and thereby directly prevents contraction. 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 acetylcholine is not released from the motor neuron.
Which of the following triggers the RNAi pathway?
A) mRNA B) rRNA C) tRNA D) shRNA E) snRNA
How does a nucleus in G2 differ from a nucleus in G1?
a. The G2 nucleus has double the amount of DNA as the G1 nucleus. b. DNA synthesis occurs only in the G1 phase. c. Inactive cells are arrested only in the G2 phase. d. During G2, the cell prepares for S phase. e. All of the above