Where does the Krebs (citric acid) cycle occur in eukaryotic cells?
a) the chloroplasts
b) the inner mitochondrial membrane
c) the mitochondrial matrix
d) the Golgi apparatus
e) the outer mitochondrial membrane
Ans: c) the mitochondrial matrix
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In an enzyme-catalyzed reaction, the reactant is called the
A. coenzyme B. catalyst C. substrate D. product
Gamma rays cause biological damage in living systems by
A. producing reactive molecules such as superoxide and hydroxyl-free radicals. B. causing tiny gravity sinks and black holes to be formed in the substance. C. introducing toxins. D. making the substance radioactive.
In humans and some primates, which category of neurons is composed of the greatest number of cells?
a. efferent neurons b. afferent neurons c. interneurons d. motor neurons e. sensory neurons
The normal sex chromosomal combination for a human female is
A. XYY. B. XY. C. YY. D. XX. E. XXX.