If a membrane is impermeable to water, the flow in and flow out will both be zero
a. True
b. False
a
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Antibody-mediated immunity is particularly effective against
A) extracellular pathogens. B) intracellular pathogens. C) both extra- and intracellular pathogens. D) None of the answers are correct.
Which statement about RNA viruses is true?
a. Mutations of RNA viruses occur frequently. b. RNA viruses contain both DNA and RNA in their cores. c. RNA viruses cause chickenpox and hepatitis B. d. RNA viruses are more stable than DNA viruses.
Cultures of a bacterial strain were incubated in a refrigerator (5°C), on a lab bench (22°C), in a 37°C incubator, and in a 50°C incubator. After incubation, there was no growth at 37°C and 50°C, slight growth in the refrigerator, and abundant growth on the lab bench top. Which term best describes this organism?
A. Capnophile B. Mesophile C. Halophile D. Psychrotroph E. Anaerobe
Which method of birth control prevents follicle development?
A) diaphragm B) birth control pill C) female condom D) intrauterine device