Enzyme Quiz: Test Your Knowledge! Trivia

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| By MTLJL

MTLJL

Community Contributor

Quizzes Created: 1 | Total Attempts: 370

Questions: 10 | Attempts: 373 | Updated: Mar 20, 2023

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Questions and Answers

1.

Enzymes are usually ____________ in nature.
- A.
  
  Carbohydrate
- B.
  
  Fat
- C.
  
  Iron
- D.
  
  Protein
Correct Answer
D. Protein

Explanation
Enzymes are usually proteins in nature. Proteins are large molecules made up of amino acids and they play a crucial role in biological processes. Enzymes are a specific type of protein that act as catalysts, speeding up chemical reactions in the body. They are involved in various metabolic processes, such as digestion, energy production, and DNA replication. Enzymes have specific shapes that allow them to bind to substrates and facilitate chemical reactions. Therefore, the correct answer is protein.

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2.

Which of the following statements regarding enzymes is NOT true?
- A.
  
  A cell without ribosomes will not be able to produce enzymes.
- B.
  
  An enzyme can still function if the shape of its active site is altered.
- C.
  
  All enzymes are biological catalysts.
- D.
  
  Enzyme action is affected by temperature and pH.
Correct Answer
B. An enzyme can still function if the shape of its active site is altered.

Explanation
The substrate cannot bind to an enzyme if the shape of the active site is altered.

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3.

Which of the following is NOT an example of an enzymatic reaction?
- A.
  
  Break down of proteins into polypeptides in the duodenum
- B.
  
  Curdling of milk in the stomach
- C.
  
  Digestion of cellulose by bacteria
- D.
  
  Emulsification of fats
Correct Answer
D. Emulsification of fats

Explanation
The breakdown of proteins into polypeptides in the duodenum involves proteases. Curdling of milk in the stomach involves the enzyme, rennin. Cellulose is digested by cellulase. Emulsification is a process whereby fats are broken down into tiny fat droplets (physical process).

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4.

Under which conditions would salivary amylase act on a solution of starch most rapidly?
- A.
  
  PH 2, 25°C
- B.
  
  PH 2, 70°C
- C.
  
  PH 7, 25°C
- D.
  
  PH 7, 70°C
Correct Answer
C. PH 7, 25°C

Explanation
Enzymes denature at high temperatures. Optimum pH of salivary amylase is pH 7.

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5.

What are the products formed from the breakdown of oil by lipase?
- A.
  
  Amino acids
- B.
  
  Fatty acids and glycerol
- C.
  
  Glucose
- D.
  
  Lipids
Correct Answer
B. Fatty acids and glycerol

Explanation
Lipase is an enzyme that breaks down lipids, such as oil, into their components. Fatty acids and glycerol are the products of this breakdown process. Therefore, when oil is broken down by lipase, it forms fatty acids and glycerol.

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6.

What is the enzyme found in potato that is able to react with hydrogen peroxide?
- A.
  
  Amylase
- B.
  
  Catalase
- C.
  
  Lipase
- D.
  
  Protease
Correct Answer
B. Catalase

Explanation
Catalase is the correct answer because it is an enzyme found in potato that is able to react with hydrogen peroxide. Catalase is responsible for breaking down hydrogen peroxide into water and oxygen, which helps protect the potato from oxidative damage. Amylase, lipase, and protease are enzymes that have different functions and are not involved in the reaction with hydrogen peroxide.

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7.

Which of the following are characteristics of enzymes? 1. Enzymes are highly specific. 2. Enzymes remain unchanged at the end of their reactions. 3. Enzymes are required in large amounts.
- A.
  
  1 and 2 only
- B.
  
  1 and 3 only
- C.
  
  2 and 3 only
- D.
  
  All of the above.
Correct Answer
A. 1 and 2 only

Explanation
Enzymes can be used over and over again. Hence, only a small amount of enzyme is required to catalyze a large number of chemical reactions.

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8.

Which of the following enzymes works well when it is mixed with distilled water?
- A.
  
  Salivary amylase
- B.
  
  Pancreatic amylase
- C.
  
  Pepsin
- D.
  
  Lactase
Correct Answer
A. Salivary amylase

Explanation
Salivary amylase works well when mixed with distilled water because it is an enzyme that breaks down carbohydrates, specifically starches, into simpler sugars. Salivary amylase is produced in the salivary glands and is present in saliva. When mixed with distilled water, it can effectively catalyze the hydrolysis of starch molecules into maltose and dextrin. This is because distilled water provides an optimal environment for the enzyme to function, without any interference from other substances that may inhibit its activity.

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9.

Which of the following statements about enzymes is NOT correct?
- A.
  
  Enzymes allow chemical reactions to take a shorter time to complete.
- B.
  
  Enzymes are temperature sensitive.
- C.
  
  Enzymes break down complex substances only.
- D.
  
  Enzymes catalyse reversible reactions.
Correct Answer
C. Enzymes break down complex substances only.

Explanation
Some enzymes are involved in anabolic reactions.

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10.

According to the 'lock and key' hypothesis, what is represented by the lock and key?
- A.
  
  The lock represents the enzyme while the key represents the substrate.
- B.
  
  The lock represents the active site while the key represents the enzyme.
- C.
  
  The lock represents the product while the key represents the substrate.
- D.
  
  The lock represents the enzyme while the key represents the product.
Correct Answer
A. The lock represents the enzyme while the key represents the substrate.

Explanation
In the 'lock and key' hypothesis, the lock represents the enzyme while the key represents the substrate. This analogy suggests that the enzyme (lock) and substrate (key) have complementary shapes that fit together specifically. Just as a key can only fit into a specific lock, a substrate can only bind to a specific enzyme. This interaction between the lock (enzyme) and key (substrate) is essential for the enzyme to catalyze a specific chemical reaction.

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Current Version
Mar 20, 2023

Quiz Edited by
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Mar 07, 2014

Quiz Created by
MTLJL

Enzyme Quiz: Test Your Knowledge! Trivia

Enzymes are usually ____________ in nature.

Which of the following statements regarding enzymes is NOT true?

Which of the following is NOT an example of an enzymatic reaction?

Under which conditions would salivary amylase act on a solution of starch most rapidly?

What are the products formed from the breakdown of oil by lipase?

What is the enzyme found in potato that is able to react with hydrogen peroxide?

Which of the following are characteristics of enzymes? 1. Enzymes are highly specific. 2. Enzymes remain unchanged at the end of their reactions. 3. Enzymes are required in large amounts.

Which of the following enzymes works well when it is mixed with distilled water?

Which of the following statements about enzymes is NOT correct?

According to the 'lock and key' hypothesis, what is represented by the lock and key?