Enzymes are necessary for cells because
A) enzymes slow down chemical reactions that would otherwise occur too quickly to facilitate life.
B) enzymes allow chemical reactions to occur under physiological conditions.
C) enzymes allow chemical reactions to occur under physiological conditions and within a time frame conducive to life.
D) enzymes allow chemical reactions to occur quickly enough to facilitate life.
E) enzymes allow chemical reactions to take place that would otherwise be impossible.
Answer: C) enzymes allow chemical reactions to occur under physiological conditions and within a time frame conducive to life.
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, but it is not able to attach the tRNA. What must occur for the final attachment to occur? A) The ATP must first have to attach to the tRNA. B) The binding of the first two molecules must cause a 3-D change that opens another active site on the enzyme. C) The ATP must be hydrolyzed to allow the amino acid to bind to the synthetase. D) The tRNA molecule must alter its shape to be able to fit into the active site with the other two molecules. E) The end of the tRNA must be cleaved before it can have an attached amino acid.
In the intestinal tract, Entamoeba histolytica
A. lives as a commensal in the lumen of the intestine. B. can invade the host tissue. C. can undergo excystation in the small intestine. D. All of the choices are correct.
Which disorder is characterized by the overproduction of growth hormone in an adult?
A. acromegaly B. pituitary dwarfism C. diabetes mellitus D. simple goiter E. none of these
Which symptom best indicates anaerobic cellular respiration in human muscle cells?
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