When conditions are unfavorable, some bacteria:
a. engage in conjugation
b. switch to photosynthesis
c. form spores, a resistant resting stage
d. become pathogenic
e. become nonpathogenic
c
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Which of the following statements about water is false? a. Hydrogen bonds can form between water and other polar substances
b. The oxygen atom in a water molecule carries a slight negative charge. c. The hydrogen atoms in a water molecule carry a slight negative charge. d. The three-dimensional structure of ice owes its form to hydrogen bonding between water molecules.
what is the etiology of diphtheriae?
What will be an ideal response?
How does a prokaryotic cell differ from a eukaryotic cell?
a. A prokaryotic cell has no membrane-enclosed organelles. b. A prokaryotic cell has a plasma membrane. c. A prokaryotic cell contains organelles. d. A prokaryotic cell has a nucleus. e. A prokaryotic cell has DNA.
Arthropods can serve as a reservoir for all of the following diseases EXCEPT
A) plague. B) brucellosis. C) epidemic typhus. D) yellow fever. E) malaria.