General Mechanism of Enzymes MCQs with Answers

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Welcome to the General Mechanism of Enzymes MCQs with Answers. In this post, we have shared General Mechanism of Enzymes Online Test for different competitive exams. Find practice General Mechanism of Enzymes Practice Questions with answers in Biology Tests exams here. Each question offers a chance to enhance your knowledge regarding General Mechanism of Enzymes.

General Mechanism of Enzymes Online Quiz

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Test Name: General Mechanism of Enzymes MCQ Quiz Practice
Type: Quiz Test
Total Questions: 40
Total Marks: 40
Time: 40 minutes

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General Mechanism of Enzymes

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1 / 40

Which enzyme is responsible for adding phosphate groups to molecules?

Polymerase

Kinase

Ligase

2 / 40

What is the term for the specific three-dimensional shape of an enzyme's active site?

Tertiary structure

Configuration

Tertiary structure

3 / 40

What is the specific region on an enzyme where the substrate binds?

Inactive site

Binding site

Active site

4 / 40

Which type of inhibition involves a molecule binding to an allosteric site on the enzyme?

Non-competitive inhibition

Competitive inhibition

Allosteric inhibition

5 / 40

What is the term for the process where an enzyme loses its shape and function due to a change in pH?

Activation

Denaturation

Catalysis

6 / 40

Which enzyme is responsible for breaking down starch into maltose?

Protease

Amylase

Lipase

7 / 40

What is the role of an allosteric site on an enzyme?

The site where cofactors bind

The site where the substrate binds

A site other than the active site that can regulate enzyme activity

8 / 40

What are enzymes?

Lipid molecules

Biological catalysts

Nucleic acids

9 / 40

Which type of enzyme works in both anabolic and catabolic reactions?

Amphibolic enzymes

Metabolic enzymes

Specific enzymes

10 / 40

Which type of enzyme inhibition involves a molecule binding to an allosteric site, changing the enzyme's shape?

Allosteric inhibition

Competitive inhibition

Non-competitive inhibition

11 / 40

What is the function of coenzymes in enzymatic reactions?

Assist enzymes by transferring chemical groups

Bind to the active site

Inhibit enzyme activity

12 / 40

What is the role of the active site on an enzyme?

Binds with the substrate to catalyze a reaction

Stores energy

Provides structural support

13 / 40

Which enzyme is responsible for joining two molecules together by forming a covalent bond?

Helicase

Polymerase

Ligase

14 / 40

Which enzyme is responsible for breaking down nucleic acids into nucleotides?

Helicase

Ligase

Nuclease

15 / 40

What is the term for the initial investment of energy required to start a chemical reaction?

Substrate energy

Enzyme energy

Activation energy

16 / 40

Which enzyme is responsible for breaking down lipids into fatty acids and glycerol?

Protease

Lipase

Amylase

17 / 40

Which of the following factors can denature an enzyme?

Low temperature and neutral pH

Low pressure

High temperature and extreme pH

18 / 40

What is the term for the process where an enzyme loses its shape and function due to extreme pH or temperature?

Denaturation

Activation

Catalysis

19 / 40

What is the function of an enzyme inhibitor?

Reduces or stops enzyme activity

Modifies the substrate

Enhances enzyme activity

20 / 40

What is the term for the maximum rate of an enzyme-catalyzed reaction?

Kcat

Vmax

21 / 40

What is the term for the substance upon which an enzyme acts and catalyzes a reaction?

Enzyme

Product

Substrate

22 / 40

What is the effect of substrate concentration on enzyme activity?

Initially increases, then levels off

Has no effect on enzyme activity

Decreases linearly

23 / 40

Which enzyme is responsible for breaking down hydrogen peroxide into water and oxygen?

Peroxidase

Amylase

Catalase

24 / 40

What is the name of the model that describes the interaction between an enzyme and its substrate?

Induced fit model

Substrate binding model

25 / 40

How does an enzyme affect the activation energy of a reaction?

Lowers the activation energy

Has no effect on activation energy

Raises the activation energy

26 / 40

What is the function of a holoenzyme?

An enzyme without its cofactor or coenzyme

An enzyme with inhibited activity

An enzyme with its cofactor or coenzyme

27 / 40

Which class of enzymes is responsible for breaking down proteins into amino acids?

Lipases

Proteases

Amylases

28 / 40

What is the role of the Km value in enzyme kinetics?

Maximum rate of reaction

Substrate concentration at half of Vmax

Enzyme turnover number

29 / 40

What is the effect of temperature on enzyme activity?

It decreases linearly

It remains constant

It increases until reaching an optimum, then decreases

30 / 40

What is the effect of pH on enzyme activity?

It can denature the enzyme if outside the optimal pH range

It always enhances enzyme activity

It has no effect on enzyme activity

31 / 40

Which type of inhibition involves a molecule binding to the active site, preventing substrate binding?

Allosteric inhibition

Non-competitive inhibition

Competitive inhibition

32 / 40

What is the function of competitive inhibitors?

Enhance substrate binding

Bind to an allosteric site, changing enzyme shape

Bind to the active site, preventing substrate binding

33 / 40

What is the term for a molecule that increases the rate of an enzyme-catalyzed reaction?

Inhibitor

Cofactor

Activator

34 / 40

What is the main function of enzymes in biological systems?

Provide structural support

Speed up chemical reactions

Store genetic information

35 / 40

What is the role of cofactors in enzyme function?

Assist enzymes in catalyzing reactions

Provide structural support

Inhibit enzyme activity

36 / 40

What is the function of the induced fit model in enzyme-substrate interactions?

The enzyme changes shape to better accommodate the substrate

The enzyme becomes rigid upon substrate binding

The substrate changes shape to fit the enzyme

37 / 40

What is the term for the product of an enzyme-catalyzed reaction?

Enzyme

Substrate

Product

38 / 40

What is the term for the molecule on which an enzyme acts?

Product

Substrate

Inhibitor

39 / 40

Which type of enzyme inhibition can be overcome by adding more substrate?

Competitive inhibition

Allosteric inhibition

Non-competitive inhibition

40 / 40

Which macromolecule category do enzymes belong to?

Nucleic acids

Proteins

Carbohydrates

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0 13 1 minute read