Acetyl CoA has the ability to ________.
A. directly form pyruvic acid
B. directly enter the citric acid cycle
C. be transformed back into glucose if unused
D. All of the choices are correct.
Answer: B
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The inflation reflex is activated when stretch receptors are stimulated during inspiration
Indicate whether the statement is true or false
Postganglionic autonomic fibers
a. end in a single terminal swelling, like a synaptic knob, that releases the neurotransmitter. b. have numerous varicosities in their terminal branches that simultaneously release neurotransmitter over a large area of the innervated organ rather than on single cells. c. innervate skeletal, smooth, and cardiac muscle. d. both (a) and (c) above. e. both (b) and (c) above.
Active sites on the actin become available for binding after
A) Actin binds to troponin. B) Troponin binds to tropomyosin. C) Calcium binds to troponin. D) Calcium binds to tropomyosin. E) Myosin binds to troponin.
Which T-cell receptor binds to MHC II receptors located on antigen presenting cells?
a. CD8 b. CD4 c. BRC d. TRC