Which of the following does not always alter the activity of the enzyme?
a. temperature
b. pH
c. reactant concentrations
d. inhibitors
e. lack of required cofactors
C
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Which of the following conclusions can be made if two identical insertion sequences are identified in separate locations on a chromosome?
A. The insertion sequence was transferred via simple transposition. B. The insertion sequence was a "cut-and-paste" transposon. C. A mutation occurred during transposition of the insertion sequence. D. The insertion sequence was transferred via replicative transposition.
The two major categories of extracellular signal molecules that bind to cell surface receptors are ____
a. peptide hormones and steroid hormones b. steroid hormones and neurotransmitters c. neurotransmitters and vitamins d. growth hormones and vitamins e. peptide hormones and neurotransmitters
The person credited with being the co-discoverer of
evolution by natural selection was a. Alfred Wallace. b. Charles Lyell. c. Thomas Malthus. d. James Hutton. e. John Henslow.
The first eukaryotic cells to evolve from ancestral prokaryotes were:a
fungi. b. protists. c. endosymbionts. d. plants. e. animals