Although the genetic contributions of egg and sperm
nuclei are equal, the egg contributes more to cell
differentiation because of
a. its energy reserves.
b. its cytoskeletal elements.
c. its specialized proteins.
d. its maternal messages.
e. all of these.
Answer: e
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What is the most frequent cause of infertility in males?
A. body weight B. pelvic inflammatory disease C. low sperm count D. tubal ligation E. endometriosis
Experiments by Chapeville and colleagues proved that the genetic code derives its specificity through what interactions?
A) hydrogen bonds and disulfide bonds that maintain the shape of the tRNAs B) complementary base pairing between amino acids and tRNA C) complementary base pairing between tRNA and mRNA D) ionic bonds between the small and large subunits of the ribosome E) hydrogen bonding between the ribosomal subunits and the mRNA
Which of the following does NOT describe an anaphylactic response?
A. Associated with high concentration of chemical mediators. B. All statements describe the anaphylactic response. C. Allergens do not act directly on the target organ. D. Allergen route of entry is always due to inhalation. E. Sudden respiratory and circulatory disruption that can be rapidly fatal.
Overexploitation of many species has increased due to the growing demand for wild animals and plants, and
A) the dramatic increase in world population. B) global warming. C) technological advances that have made it easier to obtain the animals and plants. D) an increase in the number of core reserves. E) sustainable agriculture, which has become more popular.