Which of the following groups is crucial to the structure and function of the sex hormones estrogen and testosterone?
A) Nucleic acids B) Lipids C) Carbohydrates D) Proteins
B
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________ is the turnover number for a given enzyme.
Fill in the blank(s) with the appropriate word(s).
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 "chemical X is toxic to fish" in their lab notebook. This statement is a(n) ____.
a. interpretation b. prediction c. hypothesis d. result e. theory
Covalent modification
A) can activate an enzyme. B) affects the activity of an enzyme by adding or removing a chemical group. C) can involve the addition of phosphate groups. D) produces modifications that can sometimes be reversed. E) All of these are correct.
If an animal ignores a stimulus that is continuously present, we say that the animal has
A. instinctively blocked out the stimulus. B. imprinted on a different stimulus. C. habituated to the stimulus. D. None of these answers is true.