The nitrogen cycle on land begins with
a. nitrification.
b. denitrification.
c. decomposition.
d. uptake by producers.
e. nitrogen fixation
E
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One unique feature of fertilization in flowering plants compared with animals is that _____
A) only plant sperm are motile B) fertilization in flowering plants involves double fertilization C) fertilization in flowering plants does not involve nuclear fusion D) in flowering plants the gametes are diploid, not haploid as they are in animals
Primary protein structure is dependent on
a. hydrophobic interactions. b. hydrogen bonds between two amino acids. c. covalent linkages between carbons and nitrogens of adjacent amino acids. d. covalent linkages between carbons and oxygens of adjacent amino acids. e. all of these
Protein digestion begins in the
a. mouth. b. stomach. c. small intestine. d. large intestine. e. esophagus
The Q cycle can
A) transport protons out of the matrix without additional electron transfer between complexes I and III. B) associate with complex IV. C) transfer electrons to O2. D) generate superoxide. E) All of the above can be performed by the Q cycle.