Which of the following represents a different principle for food preservation?
A. Heating
B. Addition of salt
C. Freeze-drying
D. Smoking
Answer: A
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Comb-jellies, or ctenophores, are similar to cnidarians in that they (select all that apply):
A. are radially symmetrical. B. have two tissue layers surrounding a gelatinous interior. C. differentiate muscle cells and a simple nerve net. D. digest prey within their gastric cavity. E. none of these
The subunits of proteins are ________
a. monosaccharides b. nucleotides c. amino acids d. fatty acids
The diffusion of water across a selectively permeable membrane is
A. facilitated diffusion. B. active transport. C. simple diffusion. D. osmosis. E. phagocytosis.
Auxins are secreted by
a. most tissues undergoing ripening. b. apical meristems of shoots. c. vascular tissues of stems and leaves. d. root caps. e. root cells in response to water stress.