The enzyme nitrogenase is most directly involved in the process called ____
a. nitrification
b. ammonification
c. nitrogen cycling
d. nitrogen fixation
e. nitrogen assimilation
ANSWER: d
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a. inorganic molecules that absorb all light b. organic molecules that absorb all light c. inorganic molecules that absorb specific wavelengths of light d. organic molecules that absorb specific wavelengths of light e. inorganic molecules that reflect specific wavelengths of light
A —COOH group is a(n) _____ group
a. carboxyl b. hydroxyl c. amino d. methyl e. carbonyl
Chewing
a. chemically breaks up the food. b. aids in forming the food into a consistency suitable for swallowing. c. decreases the surface area of food exposed to digestive enzymes. d. is the first phase of peristalsis. e. requires teeth.
Metabolism is the sum total of all the chemical reactions that go on in the cells.
Indicate whether the statement is true or false. A. True B. False