Which type of mating system do most animals exhibit?
A. polygyny
B. monogamy
C. polyandry
D. None of these choices are correct.
Answer: A
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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? rev: 01_20_2015_QC_CS-4567 A. Binding to the competitive inhibitor is essential for the function of the enzyme B. These mutations most likely affect an allosteric site on the enzyme C. These mutations lower the activation energy of the reaction catalyzed by the enzyme D. These mutations most likely change the shape of the active site of the enzyme
Chromosomes decondense into chromatin at which point in the cell cycle?
a. at the beginning of S phase b. at the end of interphase c. at the beginning of prophase d. at the beginning of metaphase
e. at the end of telophaseTropical forests receive ____
a. intense solar radiation and heavy rainfall b. moderate solar radiation and heavy rainfall c. intense solar radiation and virtually no rainfall d. moderate solar radiation and moderate rainfall e. low solar radiation and heavy rainfall
The molecular fragment on an antigen molecule that a lymphocyte recognizes and responds to is called a/an
A. variable region. B. antigen binding site. C. epitope. D. hapten.