Amylase is an enzyme that breaks down starch. Why can't the same enzyme break down cellulose?
A. The enzyme cannot attack cellulose because of its helical shape.
B. Cellulose molecules are much too large.
C. Starch is made of glucose; cellulose is made of fructose.
D. The bonds between the monosaccharide monomers in cellulose are much stronger.
E. The monosaccharide monomers in cellulose are bonded together differently than in starch.
Ans: E. The monosaccharide monomers in cellulose are bonded together differently than in starch.
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For every 10°C increase in temperature, the rate of most chemical reactions will
(a) double. (b) triple. (c) increase by 100 times. (d) stop.
What happens in an electron transport chain?
a. Electrons move from a low energy level to a higher energy level. b. Electron movement generates energy which can be harvested. c. Electrons combine with hydrogen ions to generate electron carriers, like NADH. d. Energy is consumed. e. The energy generated is used to break down coenzymes like NADH and ATP
The Klamath-Siskiyou forest in southwestern
Oregon is endangered due to
a. logging. b. over-predation. c. plant diseases. d. introduced species. e. more than one of these.
Once we have used character data to infer a tree, how can we be certain this tree is correct?
a. We can't; we can only estimate a ‘best fit.' b. We can test statistical confidence that the tree or some portion of it is correct. c. In most cases, we can ascertain whether our tree is correct with 95% confidence. d. All of the above. e. None of the above.