Which of the following are virulence factors?
A. Toxins
B. Enzymes
C. Capsules
D. All of the choices are correct.
D. All of the choices are correct.
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A researcher is culturing several different strains of bacteria in the same petri dish. One day, he finds that all of the strains have died off except one. He continues to grow his bacteria for several weeks, and new strains develop
However, after a month he again notices that all but one of his bacterial strains have died off. This is an example of: A. acyclic selection. B. continuous selection. C. artificial selection. D. nonperiodic selection. E. periodic selection.
Bacteria play an insignificant role in the pelagic realm
Indicate whether the statement is true or false
One function performed by astrocytes is to:
a. form myelin sheaths b. induce synapse formation c. circulate cerebral spinal fluid d. phagocytize bacteria e. transmit action potentials
Which of the following is the most important force in shaping evolution?
A) the fixity of species B) random events C) biological research D) natural selection