The second messenger for the hormone mechanism in the accompanying figure is:
a. ATP.
b. G protein.
c. cAMP.
d. calmodulin.
e. Ca2+.
c
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Which of the following molecules is not a carrier of electrons in the electron transport system (ETS)?
A) flavoproteins B) copper-nickel compounds C) cytochromes D) iron-sulfur proteins E) coenzyme Q
Central nervous system (CNS) diseases caused by fungus may occur in
A. cancer patients. B. diabetics. C. AIDS patients. D. immunosuppressed people. E. All of the choices are correct.
Lysozyme is an enzyme that breaks down bacterial cell walls and is found in your tears, mucus, and saliva. A mutation occurs in the gene for lysozyme that results in a lysine (a positively charged amino acid) being substituted for an arginine (also a
positively charged amino acid). Do you think that the mutant lysozyme will function similarly to the normal lysozyme? A) no, because all changes in protein primary sequence result in functional differences B) no, because changing lysine to arginine will cause the protein to denature C) yes, because both lysine and arginine are positively charged so the tertiary structure and therefore function should be similar D) yes, because protein function stays the same no matter what mutations occur
Feedback inhibition is defined as a mechanism of down-regulating enzyme activity by the accumulation of a product earlier in the pathway
a. true b. false