9th Class Biology Chapter 6 MCQs with Answers

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Grade 9 Biology Chapter 6 Online Quiz

By presenting 3 options to choose from, 9th Class Chapter 6 Quiz which cover a wide range of topics and levels of difficulty, making them adaptable to various learning objectives and preferences. You will have to read all the given answers of 9th Class Questions and Answers and click over the correct answer.

• Test Name: 9th Class Chapter 6 Quiz Practice
• Type: Quiz Test
• Total Questions: 40
• Total Marks: 40
• Time: 40 minutes

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9th Class Biology Ch 6: Enzymes

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1 / 40

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

Enzyme

Substrate

Product

2 / 40

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

Maximum rate of reaction

Enzyme turnover number

Substrate concentration at half of Vmax

3 / 40

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

Denaturation

Activation

Catalysis

4 / 40

What is the function of a holoenzyme?

An enzyme with its cofactor or coenzyme

An enzyme with inhibited activity

An enzyme without its cofactor or coenzyme

5 / 40

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

Specific enzymes

Amphibolic enzymes

Metabolic enzymes

6 / 40

What is the role of cofactors in enzyme function?

Provide structural support

Inhibit enzyme activity

Assist enzymes in catalyzing reactions

7 / 40

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

Non-competitive inhibition

Competitive inhibition

Allosteric inhibition

8 / 40

What is the function of an enzyme inhibitor?

Reduces or stops enzyme activity

Modifies the substrate

Enhances enzyme activity

9 / 40

What is the effect of substrate concentration on enzyme activity?

Decreases linearly

Has no effect on enzyme activity

Initially increases, then levels off

10 / 40

What is the effect of temperature on enzyme activity?

It decreases linearly

It increases until reaching an optimum, then decreases

It remains constant

11 / 40

Which enzyme is responsible for breaking down starch into maltose?

Amylase

Lipase

Protease

12 / 40

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

Enzyme energy

Activation energy

Substrate energy

13 / 40

What is the effect of pH on enzyme activity?

It has no effect on enzyme activity

It always enhances enzyme activity

It can denature the enzyme if outside the optimal pH range

14 / 40

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

Kcat

Vmax

Km

15 / 40

What is the function of coenzymes in enzymatic reactions?

Inhibit enzyme activity

Assist enzymes by transferring chemical groups

Bind to the active site

16 / 40

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

Nuclease

Ligase

Helicase

17 / 40

What is the function of competitive inhibitors?

Enhance substrate binding

Bind to the active site, preventing substrate binding

Bind to an allosteric site, changing enzyme shape

18 / 40

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

Denaturation

Catalysis

Activation

19 / 40

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

Competitive inhibition

Allosteric inhibition

Non-competitive inhibition

20 / 40

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

Inactive site

Binding site

Active site

21 / 40

What are enzymes?

Lipid molecules

Biological catalysts

Nucleic acids

22 / 40

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

Non-competitive inhibition

Competitive inhibition

Allosteric inhibition

23 / 40

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

Protease

Lipase

Amylase

24 / 40

Which enzyme is responsible for adding phosphate groups to molecules?

Kinase

Polymerase

Ligase

25 / 40

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

Has no effect on activation energy

Lowers the activation energy

Raises the activation energy

26 / 40

Which macromolecule category do enzymes belong to?

Carbohydrates

Nucleic acids

Proteins

27 / 40

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

Activator

Inhibitor

Cofactor

28 / 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

29 / 40

What is the main function of enzymes in biological systems?

Provide structural support

Store genetic information

Speed up chemical reactions

30 / 40

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

Catalase

Peroxidase

Amylase

31 / 40

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

Amylases

Lipases

Proteases

32 / 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

33 / 40

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

Non-competitive inhibition

Allosteric inhibition

Competitive inhibition

34 / 40

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

The substrate changes shape to fit the enzyme

The enzyme becomes rigid upon substrate binding

The enzyme changes shape to better accommodate the substrate

35 / 40

Which of the following factors can denature an enzyme?

Low temperature and neutral pH

High temperature and extreme pH

Low pressure

36 / 40

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

Ligase

Helicase

Polymerase

37 / 40

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

Substrate

Inhibitor

Product

38 / 40

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

Product

Enzyme

Substrate

39 / 40

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

Substrate binding model

Induced fit model

Induced fit model

40 / 40

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

Tertiary structure

Configuration

Tertiary structure

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