What is the significance of upright walking?
A) It facilitates circulation.
B) It facilitates digestion.
C) It provides good posture.
D) It frees the hands for gathering and carrying food.
E) It facilitates social interactions.
D
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Respiratory surfaces in all vertebrates have
A. moist epithelia. B. large surface areas. C. thin epithelia. D. a very high degree of vascularization. E. All of the answers for this question are correct.
In 2000, 87% of the wild rat populations in Stadtlohn, Germany was resistant to the poison bromadiolone. This
indicates that ____was/were commonly used as a rat poison(s) here, and the rat's resistance is an example of ____ selection.
a. warfarin; directional b. bromadiolone; directional c. both warfarin and bromadiolone; disruptive d. neither warfarin nor bromadiolone; stabilizing e. bromadiolone; disruptive
Which of the following is an example of active transport across a membrane?
A. The movement of water from a nephron into the collecting duct of the kidney B. The movement of glucose by facilitated diffusion into a liver cell C. The movement of water from the inside of a cell into a surrounding hypertonic medium D. The movement of Na+ into a neuron as a nerve impulse is generated E. The movement of H+ into a thylakoid disc during photosynthesis
Simple sugar converts from a straight-chain into a ring form when the __________ group combines with a hydroxyl group.
A. aldehyde B. sulfhydryl C. amine D. carbonyl E. methyl