Oxygen and carbon dioxide exchange between the circulatory system and tissues occurs at the
1.arteries.
2.veins.
3.venules.
4.arterioles.
5.capillaries.
5
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Which of the following can directly participate in creating the binding specificity of an enzyme active site? Choose all that apply
A. hydrophobic amino acid side chains B. hydrophilic amino acid side chains C. alpha helical regions of the polypeptide D. beta-sheet regions of the polypeptide E. negatively charged amino acid side chains F. positively charged amino acid side chains
When NAD+ combines with hydrogen and an electron, the NAD+ becomes:
a. reduced b. oxidized c. phosphorylated d. denatured e. inactivated
Herd immunity fails when what percentage of the population is NOT vaccinated?
A) 1% B) 5% C) 10% D) 50%
What would happen if NAD+ was not generated for the citric acid cycle?
A) The pyruvate would be recycled back to glycolysis to form glucose again. B) Oxygen would accept the high-energy electrons and form water. C) The cycle would continue until NAD+ was available again. D) The further breakdown of pyruvate in the citric acid cycle would halt. E) Oxaloacetate and water would combine to create acetyl-CoA.