In the above figure, why does the curve sharply drop after approximately 45?C instead of mirroring the
slope of the line going from 0?40?C?
a. At high temperatures, the reactions proceed so quickly that enzymes are no longer helpful
or required.
b. This is true of all catalysts and is not due to any special features of enzymes.
c. The kinetic energy of the reactants is so great that it destabilizes the enzyme and
diminishes the enzyme's activity.
d. The kinetic energy of the reactants is lower than that of the products, forcing a change in
enzyme activity.
e. The enzyme begins to denature above a certain temperature, eliminating all catalytic
activity of the protein.
E
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In the lac operon, Is mutations allow
A) constitutive expression of Lac proteins. B) regulated expression of Lac proteins. C) ?-galactosidase activity only. D) no expression of Lac proteins. E) none of the above
In a testcross, if all the offspring show the dominant phenotype, then the individual with the unknown genotype was
A. heterozygous recessive. B. homozygous recessive. C. heterozygous. D. a clone of the other testcross individual. E. homozygous dominant.
Consider how many of each type of atom is present in a single molecule of glucose. Which of the following pairings is incorrect?
a. H = 12 b. O = 12 c. C = 6
Restriction enzymes
A) facilitate nucleotide base pairing. B) cut DNA at specific sites. C) stop transcription and translation. D) bind together strands of DNA.