Practice Questions

nmdcat.online BIO NMDCAT
Jul 11, 2026

An enediolate intermediate is most likely stabilized by

A. A hydrophobic pocket
B. A positively charged metal ion or lysine residue
C. A negatively charged aspartate residue
D. A neutral cysteine residue
nmdcat.online BIO NMDCAT
Jul 11, 2026

The hydrophobic effect contributes to enzyme catalysis primarily by

A. Dissolving the enzyme in membranes
B. Driving substrate binding into the hydrophobic active site
C. Preventing substrate entry
D. Causing enzyme denaturation
nmdcat.online BIO NMDCAT
Jul 11, 2026

Donation of a proton from hydronium ion (H?O?) in solution to the substrate is an example of

A. General acid catalysis
B. Specific acid catalysis
C. Covalent catalysis
D. Metal ion catalysis
nmdcat.online BIO NMDCAT
Jul 11, 2026

A Lineweaver Burk plot supporting a ping pong mechanism shows

A. Lines intersecting on the x axis
B. Parallel lines at varying substrate concentrations
C. A single straight line
D. A sigmoidal curve
nmdcat.online BIO NMDCAT
Jul 11, 2026

The active site of an enzyme is usually located in a deep cleft or pocket because it

A. Protects the enzyme from phosphorylation
B. Provides a large flat surface for adsorption
C. Sequesters the substrate from bulk solvent and creates a specialized environment
D. Allows simultaneous binding to DNA and proteins
nmdcat.online BIO NMDCAT
Jul 11, 2026

Observation of a burst phase of rapid product formation followed by a slower steady state phase suggests

A. Random sequential binding
B. Rate limiting formation of a covalent enzyme substrate intermediate
C. Rate limiting release of the first product
D. Slow activation of the free enzyme
nmdcat.online BIO NMDCAT
Jul 11, 2026

Vmax of an enzyme catalyzed reaction is reached when

A. The enzyme is denatured
B. Product concentration becomes zero
C. Further increase in substrate concentration fails to increase the reaction rate
D. Km becomes zero
nmdcat.online BIO NMDCAT
Jul 11, 2026

In aldolase, formation of a Schiff base between lysine and the substrate is an example of

A. Cofactor mediated catalysis
B. Covalent catalysis
C. Metal ion catalysis
D. General acid catalysis
nmdcat.online BIO NMDCAT
Jul 11, 2026

Stereospecificity in enzyme action means the enzyme can

A. Change its own stereochemistry
B. Produce racemic products
C. Distinguish between optical isomers and act on only one
D. Convert every substrate into its optical isomer
nmdcat.online BIO NMDCAT
Jul 11, 2026
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