A somatic cell from a garden pea normally contains 14 chromosomes. How many sister chromatids would that cell contain during G1 of the cell cycle?
A. 7
B. 14
C. 0
D. 28
Answer: C
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What mechanism leads to changes in allele frequencies due to random chance?
A. Genetic drift B. Natural selection C. Sexual selection D. Neutral variation E. inbreeding
Which event of fertilization occurs first?
A. fast block to polyspermy B. the entry of sperm DNA into the egg C. the slow block to polyspermy D. the acrosomal reaction E. the cortical reaction
Which of the following is an advantage of water as a respiratory medium?
a. Water holds less O2 than air. b. In water, O2 concentration can be affected by solute concentration. c. The density of water makes it more difficult to ventilate over the respiratory surface. d. In water, O2 concentration can be affected by temperature. e. Water keeps the respiratory surface wetted.
An example of an irreversible inhibitor is
A) a competitive inhibitor. B) angiotensin converting enzyme (ACE) inhibiting drugs. C) a noncompetitive inhibitor. D) penicillin. E) isoleucine.