Multiple Choice Questions on Enzymes:
1. What is enzyme?
A. Enzymes are the biocatalyst which enhanced the rate of reaction.
B. Enzymes accelerate reactions by lowering the activation energy.
C. Enzymes are proteins whose three-dimensional form is key to their function and enzymes do not alter the overall change in free energy for a reaction.
D. All of these
Answer: D
2. What is the nature of an enzyme?
A. Vitamin
B. Lipid
C. Carbohydrate
D. Protein
Answer: D
3. Which of the following enzymes does not match its site of action is________
A. Helicase - Phosphodiester bond
B. Peptidase-peptidase
C. ATP hydrolase - high energy phosphate bond
D. Restriction enzymes - phosphodiester bonds
Answer: A
4. What is the general mechanism of an enzyme?
A. it acts by reducing the activation energy
B. it acts by increasing the activation energy
C. it acts by decreasing the ph
D. it acts by increasing the ph
Answer: A
5. The enzyme capable of hydrolyzing salivary amylase is_________
A. protease
b. Maltase
C. amylase
D. Lipase
Answer: A
6. The enzyme that catalyzes the hydrolysis of lipase is__________
A. Maltase enzyme
B. protease
C. lipase
D. amylase
Answer: C
7. A group of enzymes that can disrupt both plant cell wall and cell membrane structure are_________
A. Amylase, cellulose, lysozyme
B. Cellulase, pectinase, protease
C. Pectinase, lysozyme, cellulase
D. Phospholipase, Amylase, Protease
Answer: B
8. What is an apoenzyme?
A. It is a protein portion of an enzyme
B. It is a non-protein group
C. It is a complete, biologically active conjugated enzyme
D. It is a prosthetic group
Answer : A
9. According to the location of the enzyme in the organism, it can be divided into intracellular enzymes and extracellular enzymes. The following are extracellular enzymes_________
A. Respiratory oxidase
B. Transcriptase
C. helicase
D. Pepsin
Answer: D
10. Which statement about proteases is incorrect________
A. Proteases breaks lipids
B. Protease can be used as a drug to treat certain diseases
C. Proteases can hydrolyze all peptide bonds
D. Using enzyme engineering to improve the stability of proteases
Answer: C
11. When a mature nerve cell is excited, the least active of the following enzymes is_______
A. ATP synthase
B. DNA polymerase
C. Respiratory enzymes
D. RNA polymerase
Answer: B
12. The following structures do not secrete digestive enzymes_________
① esophagus
② stomach
③ liver
④ Pancreas
⑤ small intestine
⑥ large intestine
A. ②④⑤
B. ①③⑥
C. ③④⑤
D. ②③④⑤
Answer: B
13. Which of the following statements about enzymes is correct______
A. All enzymes are proteins
B. High temperature can destroy the molecular structure of the enzyme and lose its activity
C. Enzymes have the same catalytic efficiency as inorganic catalysts
D. Both A and B
Answer: D
14. Allosteric enzyme possesses___________
A. Active site and an allosteric site
B. Active site and two types of allosteric sites
C. Active site and three types of allosteric sites
D. Three types of allosteric sites
Answer : D
15. Which of the following statements about enzymes and ATP is true_________
A. ATP hydrolysis products do not have high-energy phosphate bonds
B. Enzymes are synthesized by transcription and translation
C. Each stage of anaerobic respiration produces a small amount of ATP
D. Lysozyme can dissolve the cell wall of bacteria, belonging to non-specific immunity
Answer: D