Free Enzymes MCQs with Answers

• A. Assist in enzyme synthesis
• B. Assist in enzyme inhibition
• C. Assist in enzyme activity
• D. Both A and B

Explanation: Co-factors are organic or inorganic molecules that help to assist in the enzymatic activity.

• A. Cofactor
• B. Coenzymes
• C. Activator
• D. Enzymes

Explanation: Option D is correct as "enzymes" catalyse reactions and don't take part in the response; therefore, they do not change.

• A. Collisions between enzyme and substrate molecules increase because of increased kinetic energy.
• B. Collisions between enzyme and substrate molecules increase because of increased heat energy
• C. Collisions between enzyme and substrate molecules increase because more active sites are available
• D. Collisions between enzyme and substrate molecules increase because more substrate molecules are available

Explanation: Option C is correct as increased enzyme concentration allows for a higher frequency of effective "collisions between enzyme and substrate…

• A. Enzyme-substrate complex
• B. Enzyme complex
• C. Eubstrate complex
• D. Structural complex

Explanation: The enzyme substrate complex is a temporary molecule formed when an enzyme comes into perfect contact with its substrate.

• A. Coenzyme
• B. Holoenzyme
• C. Cofactor
• D. Apoenzyme

Explanation: NAD is a coenzyme that mediates redox reactions through a transfer of electrons between NAD+ (its oxidized form) and NADH (its reduced…

• A. Vitamin B
• B. Vitamin B1
• C. Vitamin B2
• D. All of these

Explanation: All of the water-soluble vitamins and two of the fat-soluble vitamins, A and K, function as cofactors or coenzymes.

• A. 30
• B. 35
• C. 32
• D. 37

Explanation: Enzymes of the human body work to their maximum at their optimum temperature which is 37 degrees Celsius, also equal to our normal body…

• A. Ionic
• B. Covalent
• C. Hydrogen
• D. Metallic

Explanation: Enzymes require cofactors which are involved in the formation of enzyme-substarte complex and formation of product.

• A. Allosteric enzymes
• B. Inhibitors
• C. Regulators
• D. None of these

Explanation: Regulatory enzymes are specialized forms of enzymes that have specific roles in metabolism, and their activity can be modulated by factors…

• A. Fat soluble vitamins
• B. Minerals
• C. Fats
• D. Water soluble vitamins

Explanation: . Option D is correct since water-soluble vitamins are readily absorbed by water and are immediately available to tissues for consumption.

• A. Reversible
• B. Irreversible
• C. Both a and b
• D. None of these

Explanation: Enzyme-catalyzed modifications can be both reversible and irreversible, depending on the specific reaction and the enzyme involved.

• A. Their function would decrease due to increased pH
• B. Their function would decrease due to decreased pH
• C. Their function would increase due to decreased proton concentration
• D. Their function would increase due to decreased pH

Explanation: The optimum pH for pancreatic enzymes if pH 5-10, whereas the pH in the stomach is around 1-2, so function decreases as the enzymes can be…

• A. 1
• B. 2
• C. 3
• D. 4

Explanation: There are two main models that represent enzyme-substrate interactions:Lock and key model: This model proposes that the active site of the…

• A. Methyl group
• B. Ethyl group
• C. Amino group
• D. Acetyl group

Explanation: Option A is correct since 'transmethylation', as indicated by its name, is a biologically important organic chemical reaction in which a…

• A. They have a primary structure
• B. They have a secondary structure
• C. They have a tertiary structure
• D. All of the above

Explanation: Option C is correct since the tertiary structure is the overall 3D structure of a globular protein and is produced by folding the helices…

• A. Michaelis equation
• B. Menten equation
• C. Bernoulli equation
• D. Michaelis-Menten equation

Explanation: Michaelis-Menten equation or the Km value shows the concentration required for half of the Vmax.

• A. The substrate changes its shape slightly.
• B. The enzyme changes its shape slightly.
• C. None of them changes shape.
• D. Both changes shape.

Explanation: Correct option B Since according to the induced fit model presented by koshland the binding of substrate or other molecules to enzyme…

• A. Complex
• B. Substrate of high energy
• C. Product of reaction
• D. Both Options A and B are correct

Explanation: When a substrate has been bound to the active site, the enzyme cleaves its bonds and it is converted to product.

• A. Change in the ionization of the active site of enzyme
• B. Change in the ionization of substrate
• C. Retardation or blockage of enzyme activity
• D. All of these options are correct

Explanation: All of these options are correct: If the pH of a solution changes slightly, it can result in a change in the ionization of the active site…

• A. Loosely bonded non-protein part of an enzyme
• B. Cofactor consists of metal ion
• C. Covalently bounded non-protein part of an enzyme
• D. None of these options are correct

Explanation: Covalently bounded non-protein part of the enzyme.A prosthetic group is a non-protein molecule that is covalently bound to an enzyme and…