Zinc, an essential trace element for most organisms, is present in the active site of the enzyme carboxypeptidase. The zinc most likely functions as _____
A) a noncompetitive inhibitor of the enzyme
B) an allosteric activator of the enzyme
C) a cofactor necessary for enzyme activity
D) a coenzyme derived from a vitamin
C
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You are a doctor who examines a swollen and warm puncture wound on the hand of a patient. Does the patient's immune system response to this wound tell you that every aspect of his or her immune system is functioning normally?
A. Yes, because the response of swelling and warmth at a wound site shows a complete response by both the innate and adaptive immune systems of animals. B. No, because this response does not include the response of inflammation. C. No, because this response does not include the adaptive immune response. D. No, because this response does not include the complement response or adaptive immune response. E. All the answer options are incorrect.
What is the energy generated in the first
electron transfer chain in the light-dependent reactions of photosynthesis used to do?
a. split water into oxygen, hydrogen ions, and electrons b. generate NADPH c. power the ATP synthase enzyme to produce ATP d. pump hydrogen ions into the thylakoid compartment e. generate glucose
Which whorl of the flower contains the female reproductive parts?
A. whorl 2 B. whorl 3 C. whorl 1 D. whorl 4 E. whorl 5
Covalent bonds between the nucleotides of a new DNA strand are made by the enzyme ______
Fill in the blank(s) with the appropriate word(s).