Water's pH is considered neutral when:
a. hydrogen can be bound.
b. hydrogen can be released.
c. water is slightly alkaline.
d. hydrogen and hydroxide ions are equal in number.
D
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A bacterium is found that is resistant to the antibiotic gentamicin. The bacterium was isolated in a hospital where patients were routinely given gentamicin for a variety of infections. What was the pressure that selected for this resistant population?
A) presence of gentamicin in the environment B) high mutation rate for the bacterium C) growth situation for the bacterium D) patients that did not receive the antibiotic
Questions about ultimate causes for behavior are _____ questions, while proximate questions about behavior are _____ questions.
a. what; who b. why; how c. what; how d. how; why e. complicated; simple
The above figure is of one of the most
poisonous mushrooms. Which of the following is true? a. It is a club fungus. b. It is called death cap. c. It is often mistaken for a puffball. d. It kills by causing liver and kidney failure. e. All of these are true
Plants use ________ and ________ wavelengths of light and reflect the ________ wavelength.
A. green, blue, red B. white, green, blue C. red, blue, green D. white, green, red E. green, red, blue