Refer to the figure above. Which of the structures in the figure causes the two strands of DNA to separate?
A) A
B) B
C) C
D) D
Answer: B
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The respiratory pump facilitates the return of blood to the heart by
A) raising the pressure gradient between abdominal and thoracic veins during inspiration. B) decreasing the pressure gradient between abdominal and thoracic veins during inspiration. C) squeezing blood from the rhythmic contraction of the diaphragm muscle. D) decreasing the pressure gradient between abdominal and thoracic veins during expiration. E) raising the pressure gradient between abdominal and thoracic veins during expiration
Nerve fibers that are larger in diameter and heavily myelinated (A? fibers) will depolarize before smaller, unmyelinated nerve fibers (C fibers). Which of the following would you expect to occur first when applying electrical stimulation to a muscle with a high frequency (100 Hz), but low pulse duration (100 µs)?
a. Intermittent muscle contraction (unfused tetanus) b. Consistent muscle contraction (fused tetanus) c. "Pins and needles" sensation d. Pain
How are lichens and mycorrhizae similar?
A) Both parasitize live plants, eventually killing them. B) Both are pioneer species that colonize bare rock. C) Both form symbiotic relationships with photosynthetic species. D) Both are saprophytes that decompose dead materials.
Which of the following is a coenzyme?
A) zinc B) vitamin B6 C) iron D) iodine