Free Enzymes MCQs with Answers

• A. Vitamins
• B. Carbohydrates
• C. Lipids
• D. Proteins

Explanation: Most coenzymes are vitamins or are derived from vitamins. Vitamins are organic compounds that are essential in very small (trace) amounts…

• A. Coenzyme
• B. Blocker
• C. Inhibitor
• D. Cofactor

Explanation: An inhibitor is a chemical substance which can react (in place of substrate) with the enzyme but is not transformed into product(s) and…

• A. Globular proteins
• B. Fibrous proteins
• C. Glycoproteins
• D. Lipoproteins

Explanation: Enzymes are mainly globular proteins - protein molecules where the tertiary structure has given the molecule a generally rounded, ball shape

• A. If the concentration is doubled the rate will become two-fold.
• B. If the concentration is doubled the rate will become one-fold.
• C. This relation is for an unlimited time period with unlimited enzyme concentration.
• D. All of these options are correct.

Explanation: The rate of a chemical reaction is defined as the rate of change in concentration of a reactant or product divided by its coefficient from…

• A. are bacterial enzyme
• B. convert RNA to DNA
• C. hydrolyze protein into amino acids
• D. get mutated for DNA repair

Explanation: Restriction enzyme, also called restriction endonuclease, a protein produced by bacteria that cleaves DNA at specific sites along the…

• A. Slightly acidic
• B. Slightly basic
• C. Highly acidic
• D. Highly basic

Explanation: Enterokinase has an optimal pH of 5.5, which classifies it as slightly acidic.

• A. Protein part of enzyme
• B. Non-protein part of enzyme
• C. Complete enzyme
• D. Inactive enzyme

Explanation: A holoenzyme is the complete, active form of an enzyme. It is composed of an apoenzyme, which is the protein portion, and one or more…

• A. Irreversible inhibition
• B. Reversible inhibition
• C. Competitive inhibition
• D. Non competitive inhibition

Explanation: Non-competitive inhibitors obstruct enzymatic reactions by binding to a part of the enzyme away from the active site.

• A. Carbohydrates
• B. Proteins
• C. Lipids
• D. Can be lipid or proteins

Explanation: Enzymes are biological molecules that catalyze chemical reactions in living organisms.

• A. Changing conditions within the active site
• B. Changing conditions within the protein framework
• C. Rearranging the fatty acids in active site
• D. Distorting the molecules in the allosteric site

Explanation: Enzymes lower the activation energy by changing conditions within the active site.

• A. Carbohydrates
• B. Proteins
• C. Lipids
• D. Vitamins

Explanation: Enzymes are primarily proteins that serve as biological catalysts, facilitating and accelerating biochemical reactions by lowering the…

• A. By adding activation energy requirements.
• B. By lowering the activation energy requirements.
• C. By decreasing the concentration of products.
• D. By increasing the concentration of products.

Explanation: Enzymes are biological catalysts that increase the rate of reaction by lowering the activation of the energy of the reactions.

• A. Enzyme
• B. Substrate
• C. Allosteric side
• D. All of these options are correct

Explanation: c) ES-complex:This option is correct. Uncompetitive inhibition is characterized by the binding of the inhibitor to the enzyme-substrate…

• A. Vitamin B
• B. Vitamin B2
• C. Vitamin C
• D. Vitamin B1

Explanation: Coenzymes are organic molecules that help in the catalysis of chemical reactions by binding to the active sites.

• A. Binding site
• B. Allosteric site
• C. Catalytic site
• D. None of the above

Explanation: The enzyme-substrate complex is formed in the binding site of the enzyme molecule.

• A. Emil Fischer
• B. Koshland
• C. Watson and Crick
• D. Rosalind Franklin

Explanation: The lock and key model was proposed by Emil Fischer in 1894. Emil Fischer, a German chemist, introduced this concept in the late 19th…

• A. Non-competitive
• B. Un-competitive
• C. Allosteric Enzyme
• D. Competitive inhibition

Explanation: Correct answer is option D.A type of enzyme inhibition in which enzyme activity is blocked by the presence of a chemical that competes…

• A. Enzymes are sharp in action than catalyst
• B. Catalysts used in large amount than enzymes
• C. Catalysts are inorganic while enzymes are organic in nature
• D. Enzymes need pH while catalysts do not

Explanation: Enzymes are organic chemical substances while catalysts are inorganic. Catalysts are substances that increase or decrease the rate of a…

• A. Cause chemical reaction that would not otherwise take place
• B. Change the rate of a chemical reaction
• C. Change the direction of a chemical reaction
• D. Raise the activation energy of a chemical reaction
• E. None of the given reactions

Explanation: Option A: Enzymes can not initiate a chemical reaction.They can only accelerate a chemical reaction.So,option A is incorrect.Option B…

• A. Feedback inhibition
• B. Feedback regulation
• C. Positive Feedback
• D. Enzymes activation

Explanation: B. A process through which the product of a reaction controls its own synthesis C. If a product increases its own synthesis D.