Choose ONE answer per question.

images (5)


1. An allosteric enzyme

a)      Is an enzyme molecule that is denatured too quickly

b)      Possesses more than one active site

c)      Is an enzyme molecule that binds with inhibitors only when present

d)     Is an enzyme that changes shape to fit the substrate

e)      Speeds up chemical reactions


2. The number of molecules of substrates converted to product per enzyme molecule per second is called the…

a)    Turnover number / kcat

b)   Optimum number

c)    Maximum reaction rate / Vmax

d)   Michaelis-Menten Constant / Km

e)    None of the above


3. Fill in the blanks: Enzymes __________________ the free energies of reactants/products therefore ___________________ the equilibrium of the reaction.

a)         Change/creating

b)         Change/ increasing

c)         Does not change/does not change

d)        Does not change/changing

e)         Increase/decreasing


4. Which common example of an inhibitor is used as a medicinal drug?

a)         Antibiotics

b)         Panadol

c)         Ascorbic acid

d)        Aspirin

e)         Lactate


5. Enzymes act as

a)         Protein molecules

b)         Reaction stimulators

c)         Precursor molecules

d)        Binding site for substrates

e)         Biological catalysts


6. Group specificity of enzymes is where the enzyme molecules will perform only with molecules that possess specific functional groups. Examples of such molecules are

a)         Phosphate groups

b)         Amino groups

c)         Methyl groups

d)        All of the above

e)         None of the above


7. Selective qualities of an enzyme are collectively recognized as its

a)         Rate of reaction

b)         Active site

c)         Specificity

d)        Inhibition

e)         None of the above


8. The active site of an enzyme is generally a

a)         Pocket/cleft

b)         Indentation

c)         Hole

d)        Tube

e)         Passageway


9. The interactions between the active site and the substrate are

a)         Hydrogen bonding

b)         Van Der Waals forces

c)         Hydrophobic interactions

d)        All of the above

e)         None of the above


10. Uncompetitive  inhibition

a)         Vmax remains constant, Km increases

b)        Vmax increases, Km decreases

c)         Vmax decreases, Km decreases

d)        Vmax increases, Km increases

e)         Vmax decreases, Km remains constant

good-job GOOD JOB! 😀

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  1. Pingback: Answers – Multiple Choice Exam Questions 1 | BioChemWiz - Nari R.

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