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WorksheetsEnzymes Quiz
Total questions: 15
Worksheet time: 8mins
Which of the following coenzymes is not a reducing agent
NADH
FADH2
NADP
What are enzymes made of
DNA and RNA (and some protein).
Carbohydrates.
Fats.
Proteins.
Glucoproteins
An organic substance bound to an enzyme and essential for its cavity is called:
Coenzyme
Holoenzyme.
Apoenzyme
Isoenzyme.
cofactor
Enzymes are polymers of
Hexose sugar
Amino acids.
Fatty acids
Inorganic phosphate.
An enzyme that joins the ends of two strands of nucleic acid is
Polymerase
Ligase
Synthetase
Helicase
In enzyme kinetics Km implies:
The substrate concentration that gives one half Vmax
The dissocation constant for the enzyme substrate comples.
Concentration of enzyme
Half of the substrate concentration required to achieve Vmax.
Which of the following terms are involved in Michaelis-Menten Equation?
Vmax
Km
ALL of above
In an enzyme catalyzed reaction, __________ provides information on __________ and __________ provides information on __________.
KM, chemical step, VMAX, substrate binding.
VMAX, chemical step, kCAT, substrate binding.
KD, substrate binding, kCAT, chemical step
KM, substrate binding, VMAX, chemical step.
When [S] = 0.1*KM, the velocity of an enzyme catalyzed reaction is about:
0.1*Vmax
0.3*Vmax
0.5*Vmax
0.7*Vmax.
Which type of attachment between the molecule and the enzyme changes the enzymatic activity?
Metallic
Covalent
Peptide
Glycosidic bond.
What are isoenzymes?
Same size of enzyme but different function.
Different function different size.
Multiple forms of enzyme
Both A and B.
What happens to the value to Vmax in case of irreversible inhibitors?
Decreased
Increased
Constant
Not certain
In which type of inhibition, inhibitor only binds to the ES complex?
Competitive inhibition.
Un-competitive inhibition.
Non-competitive inhibition
None of the above.
A non-competitive inhibitor of an enzyme catalyzed reaction:
Binds to the Michaelis complex (ES)
Decreases Vmax
Is without effect at saturating substrate concentrations.
Can actually increase reaction velocity in rare cases.
The first and second choices are both correct.
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