If a single-celled freshwater organism such as a protistan is transferred to saltwater, which of the following is likely to
happen?
a. The cell will burst.
b. The cell will shrink.
c. Salt will be pumped out of the cell.
d. Salt will be pumped into the cell.
e. Enzymes will flow out of the cell.
ANSWER: b
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The scientist responsible for the development of the first anti-plague vaccine in 1866 was
A. Alexandre Yersin. B. Robert Koch. C. Louis Pasteur. D. Josef Marburg.
In a living plant cell in a living plant, you would expect the cytoplasm to be ____
a. much more negatively charged than the fluid outside the cell b. essentially the same charge as the fluid outside the cell c. slightly more positively charged than the fluid outside the cell d. much more positively charged than the fluid outside the cell e. slightly more negatively charged than the fluid outside the cell
Which of the following is an example of pasteurization?
A) A public toilet is treated with disinfectants. B) A surgeon washes her hands before surgery. C) Heat is used to kill potential pathogens in apple juice. D) An autoclave is used to prepare nutrient agar. E) A nurse prepares an injection site with an alcohol swab.
Microorganisms require small quantities of this nutrient for enzyme function and maintenance of protein structure.
A) Water B) Element C) Trace element D) Growth factors E) Macronutrient