A cell with two full sets of chromosomes would be termed a cell.
A. haploid
B. germ
C. sperm
D. diploid
E. sister
D. diploid
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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 neurotransmitter release by the motor neuron is blocked at the neuromuscular junction. 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 an action potential is not generated in the muscle cell. D. A contraction fails to occur because this toxin directly prevents calcium ion release from intracellular stores. E. A contraction fails to occur because acetylcholine is not released from the motor neuron.
Today, Australia, Antarctica, and South America represent fragments of ____
a. Australasia b. Laurasia c. Gondwana d. Eurasia e. Amerasia
A prokaryote that occupies a habitat consisting of a low pH is a(n)
A. basophile. B. hydrophile. C. thermophile. D. halophile. E. acidophile.
CHAPTER 14: The fact that whales have pelvic and leg bones indicates what?
(A) they probably evolved from fish. (B) ancestral whales had legs. (C) whales should have functional legs. (D) having a pelvis is advantageous. (E) whales did not evolve by natural selection.