How many layers does the plasma membrane contain?
a. 1
b. 2
c. 3
d. 4
b. 2
Biology & Microbiology
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What is the main component of an animal cell membrane?
A. phospholipids B. polynucleotides C. aquaporins D. glycolipids E. cholesterol
Biology & Microbiology
Which of the following results in a spontaneous mutation?
A. free radicals produced by cellular metabolism B. exposure to ultraviolet light C. exposure to benzo (a)-pyrene, a chemical substance found in cigarette smoke D. exposure to ultraviolet light and benzo (a)-pyrene E. exposure to X-rays
Biology & Microbiology
Argon has 18 protons. How many electrons are in its third energy level?
a. 2 b. 4 c. 6 d. 8 e. 10
Biology & Microbiology
Prokaryotes generally range in size from
A. 20-300 mm. B. 10-100 µm. C. 10-400 nm. D. 50-100 nm. E. 1-10 µm.
Biology & Microbiology