What prevents multiple sperm from fertilizing one egg?
A) atresia
B) phagocytosis by accessory cells once one sperm contacts the membrane
C) release of granules that harden the membrane outside of the oocyte
D) egg immediately divides and becomes impervious to sperm
Answer: C
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See the provided genetic code table. A change in a single base pair could cause which missense mutation?
a. glutamic acid to threonine b. glycine to proline c. threonine to glutamine d. glutamic acid to methionine e. valine to methionine
T cells become immunocompetent where?
a. yellow bone marrow b. red bone marrow c. thymus d. thyroid
Which of the following is not true of DNA?
A) It is acidic. B) It contains deoxyribose. C) It is found in cell nuclei. D) It contains phosphate. E) It contains amino acids.
A solution that has a higher concentration of dissolved materials than the solution it is compared to is
A. hypertonic. B. hypotonic. C. hydrophobic. D. hydrophilic.