All of the following are factors in enzymecatalyzed
reactions that work alone or in
combination to lower the activation energy
EXCEPT
a. helping substrates get together.
b. orienting substrates in positions favoring
reaction.
c. breaking the laws of thermodynamics.
d. shutting out water molecules.
e. inducing a fit between enzyme and
substrate
C
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How do photoreceptors regenerate inactive cis-retinal?
a. The cell degrades the active form and synthesizes new, inactive proteins. b. Enzymes convert trans-retinal back to the inactive conformation c. trans-retinalreverts back to the inactive state on its own.
d. Active trans-retinal is digested by proteases to regenerate the inactive form. e. The mechanism is not known.
What is the function of inflammation in response to a burn from a hot iron?
a. To destroy the agent causing injury b. To repair the damaged tissue c. To destroy the agent causing injury, to limit the effects of the agent on the rest of the body, and to repair the damaged tissue d. To limit the effects of the agent on the rest of the body
During evolution, splicing factors may have originated as
a. the endonuclease encoded in Group II introns. b. the catalytic core of Group II introns. c. RNase P. d. maturases encoded in Group II introns. e. the reverse transcriptase encoded in Group II introns.
What situation would be most similar to the greenhouse effect?
A) heating up the air inside a car by parking it in the sun B) warming the air for a hot-air balloon with a propane burner C) burning kerosene in a heater to warm up the air inside a cold house D) growing plants in your office to reduce indoor air pollution