Large solutes are transported across a cell membrane by ________ .
a. osmosis
b. passive transport
c. vesicles
d. diffusion
e. proteins
Ans: c. vesicles
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Each DNA strand has a backbone that consists of
alternating a. covalent and ionic bonds. b. nitrogen-containing bases. c. hydrogen bonds. d. sugar and phosphate molecules. e. covalent and hydrogen bonds.
Which is not used as a chemical preservative in food?
A. Salt B. Organic acids C. Ethylene oxide gas D. Antibiotics E. Sulfite
Two organelles that are believed to have once been free-living bacterial cells are ________ and ________.
A. peroxisomes; lysosomes B. Golgi complex; endoplasmic reticulum C. ribosomes; nucleolus D. chloroplasts; mitochondria
Organisms called parasites are
A. free-living. B. the decomposers in ecosystems. C. always classified in the kingdom Monera. D. always viruses. E. always harmful to their host.