Which of the following is true regarding noncompetitive inhibition?
A. The amino acid sequence of an enzyme is altered.
B. Excess product blocks the active site.
C. The active site is unable to bind substrate.
D. Excess product enhances enzyme activity
Ans: C. The active site is unable to bind substrate.
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RNA polymerase II differs from RNA polymerase I and III by having
A) fewer amino acids at the N-terminus. B) additional amino acids at the N-terminus. C) fewer amino acids at the C-terminus. D) additional amino acids at the C-terminus. E) individual amino acids, but all three RNA polymerases are the same size.
Chemical bonds are based on attractions
between the ____ of two atoms.
a. electrons and protons b. protons c. protons and neutrons d. electrons e. neutrons
Why do some Basidiomycetes form a ring like organization, as observed on the top of soil?
a. They deplete the soil of magnesium. b. They deplete the soil of oxygen. c. They deplete the soil of nitrogen. d. They deplete the soil of potassium.
In humans, the "master sex switch" that determines whether an embryo will become a male is the
a. X chromosome. b. locus. c. SRY gene. d. androgen switch.