A pollen grain is actually the
A) female gametophyte.
B) combination of male and female gametophytes.
C) male gametophyte.
D) primitive egg cell, which will develop into the embryo.
E) megaspore mother cell.
C
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In the following list, identify the carbohydrate, the fatty acid, the amino acid, and the polypeptide:
a. +NH3-CHR-COO- b. C6H12O6 c. (methionine)20 d. CH3(CH2)16COOH
The space between the lens and iris is
a. the posterior cavity. b. the posterior chamber. c. the anterior chamber. d. none of the above.
Which class of nutrients provides certain "essential" organic components required in the diet because they cannot be manufactured by the body?
A. carbohydrates B. proteins C. nucleic acids D. water a. true b. false
Osmosis can only occur if water travels through the
A. cytoskeleton. B. cell wall. C. vacuole. D. ER. E. semipermeable membrane.