Free Characteristics of Enzymes MCQs with Answers
80 Characteristics of Enzymes MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Enzymes are globular biological catalysts that lower activation energy without being consumed, usually showing specificity for particular substrates. Questions cover active sites, enzyme substrate complexes, the lock and key and induced fit models, intracellular and extracellular action, and the effects of denaturation, while distinguishing enzymes from non biological catalysts.
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80 questions · page 4 of 4
- A. Prosthetic group
- B. Activator
- C. Coenzyme
- D. Inhibitor
Explanation: Some enzymes use metal ions as cofactors like Mg2+,Fe2+,Cu2+,Zn2+ etc. The detachable cofactor is known as an activator if it is an…
Correct answer: Activator- A. Hydrogen, Ionic
- B. Hydrogen, Covalent
- C. Ionic, Hydrogen
- D. Covalent, Ionic
Explanation: Enzymes are proteins in nature, and different types of bonds (Hydrogen and Ionic) maintain their structure.
Correct answer: Hydrogen, Ionic- A. 90
- B. 20
- C. 10
- D. 1
- E. None of these
Explanation: Explanation for this question will be added soon.
Correct answer: 1- A. Enzymes are mostly proteins but some are lipids also
- B. Enzymes are denatured at high temperatures
- C. Enzymes are highly specific
- D. Enzymes require optimum pH and temperature for maximum activity
Explanation: Option A: Enzymes are mostly proteins but some are lipids also: This statement is incorrect.
Correct answer: Enzymes are mostly proteins but some are lipids also- A. 1010
- B. 2010
- C. 1020
- D. 1510
Explanation: Yes, enzymes can speed up reactions by factors of up to 1010 (ten billion) or even higher.
Correct answer: 1010- A. The primary structure of enzymes
- B. The secondary structure of enzymes
- C. Tertiary structure of enzymes
- D. Quarternary structure of enzymes
Explanation: Tertiary structure of enzymes. Enzyme-substrate specificity arises from the unique three-dimensional shape of the enzyme's active site…
Correct answer: Tertiary structure of enzymes- A. Apoenzyme
- B. Holoenzyme
- C. Activated enzyme
- D. Both B and C
Explanation: Correct option is B. The answer is holoenzyme. An enzyme is a protein that catalyzes a chemical reaction.
Correct answer: Holoenzyme- A. 32 F
- B. 313 K
- C. 46 C
- D. 37 C
Explanation: This optimal temperature is usually around human body temperature (37 oC) for the enzymes in human cells
Correct answer: 37 C- A. Phenylalanine hydroxylase
- B. Phenylalanine oxidase
- C. Phenylalanine phosphate
- D. None of these
Explanation: Explanation:Phenylalanine hydroxylase is an enzyme that converts the amino acid phenylalanine to tyrosine.
Correct answer: Phenylalanine hydroxylase- A. Not produced in complete form
- B. It does not work efficiently at that time
- C. Quite capable of destroying cells internal structure
- D. None of the above
Explanation: Explanation:Pepsin is a protein-digesting enzyme and is capable of destroying cells' internal structure, as a result, it is secreted in an…
Correct answer: Quite capable of destroying cells internal structure- A. Amylase
- B. Apoenzyme
- C. Holoenzyme
- D. Coenzyme
Explanation: Option A is incorrect because Amylase is the enzyme that breakdown carbohydrates.Option B is incorrect because Apoenzyme is the enzyme…
Correct answer: Holoenzyme72. If the cofactor is covalently or tightly and permanently bonded to enzyme then it will be called:
- A. Coenzyme
- B. Prosthetic group
- C. Activator
- D. Apoenzyme
Explanation: The detachable cofactor is known as an activator if it is an inorganic ion.
Correct answer: Prosthetic group73. Some enzymes require helper which is non-protein part for its efficient functioning that is called:
- A. Accelerator
- B. Cofactor
- C. Prosthetic group
- D. Apoenzyme
Explanation: Some enzymes require non protein parts for their proper functioning. If the non-protein part is covalently bonded, it is known as a…
Correct answer: Cofactor- A. Prosthetic group
- B. Activator
- C. Co-enzyme
- D. Inhibitor
Explanation: Mg2+ is an essential inorganic activator for enzyme phosphatase, not to be confused with the prosthetic group.
Correct answer: Activator- A. Coenzymes
- B. Activators
- C. Prosthetic group
- D. Apoenzyme
Explanation: Activators are inorganic ions that bind to enzymes and play a crucial role in enzyme activity.
Correct answer: Activators- A. Coenzyme
- B. Apoenzyme
- C. Holoenzyme
- D. Denatured enzyme
Explanation: The correct answer is apoenzyme. An apoenzyme is the protein part of an enzyme that is inactive on its own.
Correct answer: Apoenzyme- A. They increase the activation energy
- B. They are specific in action
- C. They possess specific active site
- D. They possess dimensional shapes
Explanation: They increase the activation energy: This statement is incorrect. Enzymes actually decrease the activation energy required for a chemical…
Correct answer: They increase the activation energy- A. Proteins
- B. Carbohydrates
- C. Hydrocarbons
- D. None of the above
Explanation: Enzymes are specialized proteins that catalyze biochemical reactions, enabling them to occur more rapidly and efficiently.
Correct answer: Proteins- A. NAD
- B. FAD
- C. NADP
- D. ADP
Explanation: Coenzymes are non-protein, organic compounds required by many enzymes for catalytic activity.
Correct answer: ADP- A. Protien
- B. Urea
- C. Lipid
- D. ATP
Explanation: Lipase is an enzyme that helps break down lipids, which are fats and oils.
Correct answer: Lipid