For an Rh incompatibility to occur during pregnancy,
the mother must be
a. positive and the father negative.
b. negative and the father negative.
c. negative and the fetus positive.
d. negative and the father positive.
e. positive and the fetus negative.
Answer: c
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Which of the following would be used by a chemoorganotroph for energy?
A) C2H3O2- B) H2 C) CO2 D) H+
In order to prevent hair loss in men, one popular treatment is to use an inhibitor of the enzyme that converts
testosterone to a different androgen (DHT). The inhibitors are steroids similar to testosterone that cannot be converted into DHT. How would you classify this type of inhibition?
a. competitive inhibition b. noncompetitive inhibition c. allosteric inhibition d. feedback inhibition e. ionic inhibition
A buffer system
a. makes new hydrogen ions. b. eliminates hydrogen ions already present. c. binds carbon ions. d. releases hydrogen ions. e. produce excess acid.
If, when water froze, every water molecule formed a hydrogen bond with only one additional water molecule, which of the following would not happen?
a. Many aquatic organisms would not survive cold temperatures. b. Ice would likely sink to the bottom of lakes and rivers. c. Ice would be less dense than liquid water. d. Water molecules in ice would demonstrate a disorganized, non-lattice arrangement. e. Bodies of water would appear to freeze from the bottom up.