Why are girls less likely than boys to suffer
from Duchenne muscular dystrophy?
a. girls have less testosterone than boys
b. they are protected as heterozygotes
c. they do not have a Y chromosome
d. girls are NOT less likely to suffer from
Duchenne muscular dystrophy than boys
e. a combination of more than one of the first
three answers is correct
B
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Which of the following is true of transfer RNA?
A) It serves as the site of protein synthesis. B) It is an important component of ribosomes. C) It is responsible for the correct positioning of amino acids in a polypeptide. D) It functions in replication only. E) It is responsible for the correct positioning of amino acids in a nascent polypeptide.
What happens to a retinal photopigment when it captures a photon?
A. It releases an electron. B. It fluoresces. C. It changes shape. D. It begins to vibrate. E. It does nothing.
Enzymes increase the speed of a chemical reaction by
a) lowering the energy of activation. b) increasing the energy of activation. c) changing the pH of the reaction. d) increasing the temperature of the reaction.
All of the following pertain to Enterococcus faecalis, except:
A. normal flora of the human large intestine. B. increasingly resistant to many antimicrobics. C. cause nosocomial wound infections, urinary tract infections, and septicemias. D. can cause endocarditis. E. belong to Lancefield Group B streptococci.