Smart Institute NMDCAT Bio Quiz : ENZYMES
Master the Enzymes: NMDCAT Bio Quiz
Welcome to the Smart Institute NMDCAT Bio Quiz on Enzymes! Test your knowledge on the fascinating world of enzymes, their fun
You'll encounter questions covering:
- Enzyme structure and fun
ction - Enzyme activity and regulation
- Types of inhibitors and enzyme classifications
- Real-life applications and examples in science
1. Biological molecules (proteins) which catalyze a biochemical reaction and remain unchanged after completion of reaction are called A. Cofactor B. Coenzymes C. Activator D. Enzymes
A
B
C
D
2. Which statement about enzyme is incorrect: A. Some of them consist solely of protein with no non protein part. B. They catalyze a chemical reaction without being utilized. C. All enzymes are fibrous Proteins. D. They without their cofactor are called apoenzyme.
A
B
C
D
3. In which of the following location enzymes controlling cellular respiration are present? A. Nucleus B. Chlorophast C. Milochondria D. Ribosome
A
B
C
D
4. An activated enzyme consisting of polypeptide chain and a cofactor is called: A. Apoenzyme B. Holoenzyme C. Activated enzyme D. Both b and c
A
B
C
D
5. Which one forms the raw material for coenzymes? A. Vitamins B. Carbohydrates C. Proteins D. Metals
A
B
C
D
6. A cofactor made of inorganic ion which is detachable is called A. Prosthetic group B. Coenzyme C. Activator D. Cofactor
A
B
C
D
7. Enzymes _________ the activation energy of a chemical reaction A. Increases B. Decreases C. Does not effect D. Increases or decreases depending upon individual enzyme
A
B
C
D
8. A three dimensional dcavity bearing a specific charge by which the enzyme reacts with its substrate is called A. Active site B. Binding site C. Catalytic site D. Allosteric site
A
B
C
D
9. Which step causes activation of catalytic site of an enzyme? A. Change in pH of the surroundings. B. Formation of Enzyme Susstrate complex. C. Change in the charge of the active site. D. Change in temperature
A
B
C
D
10. Lock and Key model was proposed by A. Emil Fischer B. Koshland C. Robin Williams D. Rudolph Virchow
A
B
C
D
11. Which statement is incorrect about Lock and Key Model? A. Specific enzyme can transform only a specific substrate B. Active site of an enzyme is a non flexible structure. C. Active site does not change before during or even after the reaction. D. It explains the mechanism of every chemical reaction.
A
B
C
D
12. The rate of reaction is directly proportional to the concentration of an enzyme which statement is incorrect in this respect: A. Increase in enzyme molecule increases the available active sites. B. This relation is for unlimited time period with unlimited enzyme concentration C. If the concentration is doubled the rate will become two fold. D. None of these.
A
B
C
D
13. If the concentration of enzyme is kept constant and amount of substrate is increased a point is reached where increase in substrates concentration does not affect the reaction rate because of A. Enzymes get denatured at higher substrate conc. B. Rate of reaction is indirectly proportional to substrate concentration at this point. C. All the active sites on enzyme molecule are occupied. D. None of these.
A
B
C
D
14. If more substrate to already occurring enzymatic reaction is added more enzyme activity is seen because: A. There is probably more substrate present than there is enzyme. B. There is probably more enzayme available than there is substrate. C. There is probably more product present than there is either substrate or enzyme. D. The enzyme substrate complex is probably failing to form during the reaction.
A
B
C
D
15. If more substrate to already occurring enzymatic reaction is added and there is no effect on the rate of the reaction what is the form given to this situation: A. Saturation B. Denaturation C. Composition D. Inhibition
A
B
C
D
16. The active site of an enzyme: A. Never changes B. Forms no chemical bond with substrate C. Determined by structure and the specificity of the enzyme. D. They are non specific in their action.
A
B
C
D
17. Excessive increase in temperature of medium causes the enzyme molecule to A. Activate B. Unaffected C. Denatured D. None of these.
A
B
C
D
18. Extreme change in pH results in: A. Change in ionization of amino acids at the active site of the enzyme. B. Change in the ionization of the substrate. C. Denaturation of the enzyme D. Increase in the reaction rate.
A
B
C
D
19. Optimal temperature of enzymes present in human body is A. 27?C B. 37?C C. 47?C D. 30?C
A
B
C
D
20. A chemical substance which can react (in place of substrate) with the enzyme but is not transformed into product/s and thus blocks the active site temporarily or permanently is called A. Co-enzyme B. Blocker C. Inhibitor D. Cofactor
A
B
C
D
21-Inhibitors which block the enzyme by forming weak bond are called A. Competitive inhibitors. B. Non-competitive inhibitors C. Irreversible inhibitors. D. Both a and b
A
B
C
D
22. A substance which binds at the active site of the enzyme but does not result in the formation of the products is called: A. Irreversible inhibitor B. Reversible inhibitor C. Competitive inhibitor D. Non-competitive inhibitor
A
B
C
D
23. The structure of an enzyme is altered by: A. Irreversible inhibitor B. Reversible inhibitor C. Competitive inhibitor D. Non-competitive inhibitor
A
B
C
D
24. Malonic acid is an example of: A. Irreversible inhibitor B. Reversible inhibitor C. Competitive inhibitor D. Non-competitive inhibitor
A
B
C
D
25. If enzyme concentration is low than substrate pH and temperature values are equal to requirement then which of the following will increase rate of reaction. A. Increase in concentration of enzyme B. Increase in concentration of substrate C. Increase in pH D. Increase in temperature
A
B
C
D
26-The pepsin enzymes that work in the stomach cavity are classified as A-diploid enzymes B-haploid enzymes C-non-transferable enzymes D-extracellular enzymes
A
B
C
D
27-The enzymes that are used to remove resistant starch residues are called A-nucleated enzymes B-synthetic enzymes C-protease enzymes D-amylase enzymes
A
B
C
D
28-In the brewing industry, the enzymes break A-proteins and sugars B-proteins and starch C-proteins and ammonia D-proteins and alcohol
A
B
C
D
29-The trypsin enzymes work in A-pancreas B-buccal cavity C-large intestine D-small intestine
A
B
C
D
30-The enzymes that are used to remove protein stains from the clothes are called A-protease enzymes B-amylase enzymes C-nucleated enzymes D-coenzymes
A
B
C
D
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