At a neruomusclular junction involving skeletal muscle, the acetylcholine receptor is a ______ channel.

A. voltage-gated Na+
B. anion
C. cation
D. two of the above


Answer: C. cation

Biology & Microbiology

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Indicate whether the statement is true or false.

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A condition in which wheezing occurs with breathlessness and a persistent cough, and yields yellowish or greenish phlegm is

A) asthma. B) bronchitis. C) lung cancer. D) lupus. E) anemia.

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Unlike other epithelia the epithelia that make up the capillaries have holes in them called fenestrations.

a. true b. false

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Transcriptional control that acts by regulating the continuation of transcription is called:

A. antitermination. B. riboswitching. C. negative control. D. attenuation. E. operator mutation.

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