The original source of genetic variation that serves as the raw material for natural selection is ________
A) mutation
B) gene flow
C) geographic isolation
D) random fertilization
A
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The disinfectant action of phenol and phenolic derivatives mainly is due to
A. extraction of lipids from membranes. B. oxidation of disulfide bonds in proteins. C. membrane damage and protein denaturation. D. damage to nucleic acids and proteins caused by free radicals. E. its inherent detergent action.
Chromatin condenses into chromosomes and the mitotic spindle begins to form during
a. interphase. b. prophase. c. metaphase. d. anaphase. e. telophase.
Species interactions between members of a community include __________, which is helpful to one species and does
not harm the other species Fill in the blank(s) with the appropriate word(s).
Once an enzyme is denatured, it is unable to function.
A) True B) False