How many turns of the Calvin cycle are needed to make one glucose molecule?
A. 2
B. 3
C. 5
D. 1
E. 6
Answer: E
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Why would a person who has their tonsils removed be more susceptible to certain types of infections of the throat and respiratory tract?
A. Tonsils produce high levels of lactoferrin, a strong natural antibacterial compound. B. Tonsils produce large amounts of interferons, natural antiviral compounds. C. Tonsils are secondary lymphoid organs-they help to provide a constant response to the microbes in the oral cavity, helping to keep them in check and preventing them from spreading to other areas. D. Tonsils are the location where T cells develop and mature. Without them, a person won't have T cells, and will be more likely to suffer from infections that would normally be eliminated by such cells.
The number of animal species now known is about
A. 10 million. B. 100 million. C. 1 million. D. 15 million. E. 5 million.
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.
The odontophore of molluscs is part of the:
a. digestive system. b. nervous system. c. excretory system. d. defense system. e. reproductive system.