Scientists want to determine whether chemical X, a component of fertilizer, is harmful to fish. They treat fish in the
laboratory with increasing amounts of the chemical for one week and then measure their viability. When researchers
designed this experiment, they wrote "If chemical X is toxic, the fish will begin to look sick and die." This statement is
a(n) ____.
a. interpretation
b. theory
c. hypothesis
d. result
e. prediction
e
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Activator proteins in prokaryotes experience shape changes in the presence or absence of small molecules. As a consequence: (Select all correct choices)
A. they may activate genes needed only when such a small molecule is present in the cell. B. they may activate genes necessary to synthesize a specific small molecule. C. they are unable to act alone.
Diseases in animals caused by fungi are called ________.
A. funguses B. dictyoses C. mycoses D. cystoses
Why are infections caused by viruses so much more difficult to treat or cure than those caused by bacteria?
What will be an ideal response?
Carriers contribute to the spread of which of the following diseases?
a. Hepatitis b. AIDS c. Typhoid fever d. all of the above