Which statement describes the role of photosynthesis in an ecosystem?
a. Primary producers convert chemical energy to light energy.
b. Primary consumers rely directly on light energy.
c. Primary producers convert light energy to chemical energy as a service to the ecosystem, not for their own
gain.
d. Primary consumers rely on primary producers to make light energy available in a usable form.
e. Primary producers are heterotrophs and thus make no contribution to the flow of energy into the ecosystem.
ANSWER: d
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What will be an ideal response?
Assess the merits of each action potential analogy; select the representation that corresponds most accurately.
A. An action potential happens like a ripple in a pond; a ripple spreads out and gets slightly weaker as it travels. B. An action potential happens like a row of dominoes falling; the signal has constant velocity and constant strength no matter how long the row of dominoes may be. C. An action potential happens like a crowd doing the wave in a football stadium; the enthusiasm and volume increase as more people get involved.
Which of the common molecules normally found in the body plays a role in the aging process,forming irreversible cross-linkages between proteins, and contributing to the stiffness and loss of elasticity we may experience with aging?
a) glucose b) phospholipids c) water d) NaCl e) ATP
Which term refers to all of the chemical reactions of the cell?
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