Water striders are insects that literally walk on water. These insects are frequently found living on ponds. If hydrogen bonds did not exist, how would this affect the life of water striders?
What will be an ideal response?
Hydrogen bonds are responsible for the surface tension of water, the attractive force between water molecules that can make it difficult to separate them. The surface tension is strong enough to support the weight of water striders thus allowing them to walk on water. If water molecules could not form hydrogen bonds, the water striders would not be able to walk on water because there would be no surface tension to support their weight. Therefore, these insects would have to adapt to terrestrial conditions near ponds or lakes rather than living on them.
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If a motor neuron in the body were stimulated by an electrode placed about midpoint along the length of the axon ________
A) the impulse would move to the axon terminal only, and the muscle contraction would occur B) the impulse would spread bidirectionally C) muscle contraction would occur D) the impulse would move to the axon terminal only
Which statement about the parasympathetic division of the ANS is not true?
A. It conserves energy. B. It promotes sedentary activities. C. It increases activities associated with digestion. D. It shunts blood to skeletal muscles during exercise. E. It is the "rest and repose" division.
Which of the following is not a purpose of the excess postexercise oxygen consumption (EPOC) in muscle?
A) To serve elevated metabolic rate B) To restore resting levels of ATP and CP C) To replenish the phosphagen system D) To oxidize lactic acid E) To neutralize carbon dioxide buildup
Which statement about precapillary sphincters is CORRECT?
A. They are openings that allow large molecules and blood cells to leave the capillary. B. They are voluntary. C. They can close off the capillaries by contracting. D. They contract when oxygen levels in the tissue are low. E. When the precapillary sphincters are open, blood flows only through the thoroughfare channels.