Which of the following is a sulfide?
A) H2S
B) HS-
C) S2-
D) H2S, HS-, and S2- are all sulfides.
Answer: D
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Which of the following statements reflects the first law of thermodynamics?
A. The energy of the starting materials for a reaction will equal the sum of energies of the products plus energy released as heat and disorder. B. The amount of useable energy resulting from a reaction will always be less than the total energy available in the starting materials. C. The entropy of the products of a reaction will always be greater than the entropy of the starting materials. D. The entropy of the starting materials for a reaction will always be greater than the entropy of the products.
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.
Chyme is first formed in the
a. mouth. b. esophagus. c. stomach. d. small intestine. e. large intestine.
Huntington disease is _____
a. a model of a multifactorial trait, controlled by several genes b. inherited as an X-linked dominant trait c. a disease with onset in early childhood d. one that produces no significant changes in brain cells e. a model of a single gene defect affecting behavior