What are the downsides of sweat as a cooling mechanism? What will be an ideal response?
ANSWER: First and foremost, sweat means water loss. If too much water is lost, dehydration will
become a very real and immediate danger. Sweating would only evolve in organisms with
regular access to potable water. Second, sweat is only efficient in dry atmospheres where
evaporation occurs at a suitable pace. Third, sweating is most efficient on thinly-haired skin,
so to be an efficient sweater means a sacrifice of the valuable insulation that hair provides.
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Hinge joints allow movement in two dimensions (flexion and extension). Which of the following is an example of a hinge joint?
A. the hip joint B. the joints between bones of the skull C. the elbow D. the shoulder joint
________ is the second messenger associated with the regulation of blood pressure.
Fill in the blank(s) with the appropriate word(s).
You extract all of the proteins of a leaf and measure the percentage that is rubisco. You find that
rubisco comprises what percentage of the leaf proteins?
a. 10% b. 25% c. 50% d. 75% e. 90%
Which of the following structures serves as a passageway for both air and food?
A) Bronchioles B) Trachea C) Bronchi D) Larynx E) Pharynx