Which structure serves as an impenetrable barrier that prevents more than one sperm from fertilizing an egg?
A) the acrosome
B) the jelly coat of the egg
C) the sperm's plasma membrane
D) the vitelline layer
Answer: D
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Organisms that derive their energy from the sun and carbon from carbon dioxide are __________
A. photoautotrophs B. chemoheterotrophs C. photoheterotrophs D. chemoautotrophs E. chemolithotrophs
Which of the following does (do) not always require the presence of living bacteria?
A. Food poisoning B. Bacterial diarrhea C. Intoxications D. All of the choices are correct.
Natural selection
A. is evolution. B. is a key mechanism that causes evolution to happen. C. occurs at the population level. D. results in reproductive success. E. occurs at the population level and is a key mechanism that causes evolution to happen.
Which specimen culture, if positive, should be immediately reported to the clinician?
a. Urine b. Blood c. Throat d. Stool