Which area(s) of the molecule shown above is/are variable, and what is the consequence?
A. area A, each individual antibody binds
many different antigens
B. area A, each individual antibody binds a
unique antigen
C. area B, each individual antibody binds
many different antigens
D. area B, each individual antibody binds a
unique antigen
E. Both area A and area B are variable,
allowing the body to produce many different
antigens using a relatively small genome.
B
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Which of the following statements is not true of the TCA cycle?
A) Oxidation occurs at three steps in the TCA cycle. B) Decarboxylation occurs at two steps in the TCA cycle. C) ATP/GTP is generated at one point by substrate-level phosphorylation. D) Acetate enters the TCA cycle and joins a four-carbon acceptor molecule to form citrate. E) FAD is an electron acceptor in the cycle.
Allosteric enzymes
a. have active sites where substrate molecules bind and other sites that bind with inhibitor or activator molecules. b. are associated with important energy-carrying nucleotides. c. are not affected by temperature or pH. d. have two active sites. e. all of these.
Explain how the structure of a leaf contributes to the function of photosynthesis. What will be an ideal response?
The power used by most bacterial flagellar motors is produced by ________.
A. ATP hydrolysis B. synthesis of glucose C. proton motive force (PMF) D. All of the choices are correct.