An examination of the processes of muscle contraction in fishes is an example of a(n) ____
a. ecological study
b. taxonomic study
c. anatomical study
d. physiological study
e. homeostatic study
ANSWER: d
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Tears protect the eyes by
A. stimulating opsonization. B. inflammation. C. flushing and lysozyme. D. flushing and lysozyme and vasodilation. E. vasodilation.
A current problem in modern medicine is the development of drug resistance mutations. This occurs when a mutation arises in a disease-causing microbe making it resistant to a drug and thus rendering the drug useless in treating a specific disease. Many useful drugs are competitive inhibitors of specific enzymes, and the drug-resistance mutations prevent the binding of the drug. These types of mutations, in addition to preventing competitive inhibitor binding, can also sometimes reduce the activity of the enzyme. Why is that the case?
A. These mutations most likely affect an allosteric site on the enzyme B. These mutations lower the activation energy of the reaction catalyzed by the enzyme C. These mutations most likely change the shape of the active site of the enzyme D. Binding to the competitive inhibitor is essential for the function of the enzyme
The structure of a cell membrane includes a modified form of lipid called a(n) ________
Fill in the blank(s) with correct word
How does DDT in the environment affect many birds?
A. chronic liver failure in adults B. stunted growth of chicks C. neurological degeneration D. decreased reproductive rate