A colony of mice is treated with a nonvirulent strain of the bacterium Streptococcus pneumoniae. Before treatment, a
researcher exposed this nonvirulent strain to heat-killed cells of a virulent strain. What will be the effect on the mouse
population?
a. The mice will all remain healthy.
b. Some mice will die, but most will remain healthy.
c. The mice will develop pneumonia.
d. Some mice will develop pneumonia, but most will remain healthy.
e. The mice will become immune to the bacteria.
ANSWER: c
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The major macromolecules of the ECM are _____
A. polysaccharides and proteins. B. polysaccharides and fat. C. fat and nucleotides. D. nucleotides and proteins. E. fat and proteins.
A group of cells having similar structure and function is called a(n) _____
A. organ system. B. tissue. C. population. D. organ. E. organism.
One of the primary functions of RNA molecules is to _____
A) transmit genetic information to offspring B) function in the synthesis of proteins C) make a copy of itself, thus ensuring genetic continuity D) act as a pattern or blueprint to form DNA
In an ecosystem, energy
A) cycles along with chemical nutrients.
B) typically flows from consumers to producers to decomposers.
C) typically flows from producers to a series of consumers.
D) comes ultimately from bacteria.