11th Class Biology Chapter 3 MCQs with Answers

AdminApril 5, 2024

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Welcome to the 11th Class Biology Chapter 3 MCQs Practice and Quiz Tests. We are presenting you with top MCQ questions from the 11th Class Biology Chapter 3 Enzymes.

You can find all the 11th Class Biology Chapter 3 MCQs online tests on our website. These online tests are great for learning and as well as for scoring maximum marks in your Intermediate Exams. We are making these Class 11 Biology MCQs online tests for those who want full marks in their exams.

11th Class Multiple Choice Question Chapter 3 with Answers Free PDF

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Grade 11 Biology Chapter 3 Online Quiz

By presenting 3 options to choose from, 11th Class Biology Chapter 3 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 11th Class Questions and Answers and click over the correct answer.

Test Name: 11th Class Biology Chapter 3 Quiz Practice
Type: Quiz Test
Total Questions: 40
Total Marks: 40
Time: 40 minutes

Note: Answer of the questions will change randomly each time you start the test. Practice each quiz test at least 3 times if you want to secure high marks. Once you are finished, click the View Results button. If any answer looks wrong to you in Quizzes. simply comment below this post, so that we can update the answer in the quiz section.

11th Class Biology Chapter 3: Enzymes

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1 / 40

What is the name of the model that describes enzyme-substrate interactions as induced fit?

Substrate specificity model

Lock and key model

Induced fit model

2 / 40

Enzymes can be denatured by ____________.

High temperatures

High substrate concentrations

Extremes of pH

3 / 40

What is the main function of enzymes in biological systems?

Catalyze reactions

Store genetic information

Provide energy

4 / 40

Enzymes speed up chemical reactions by _____________.

Providing energy

Increasing activation energy

Lowering activation energy

5 / 40

What is the effect of increasing substrate concentration on enzyme activity in a non-saturated system?

No effect

Increases

Decreases

6 / 40

What happens to enzyme activity at extreme temperatures?

It remains constant

It decreases

It increases

7 / 40

Enzyme activity is typically highest at the ____________ temperature for that enzyme.

Optimal

Lower

Higher

8 / 40

The Michaelis constant (Km) is a measure of the ____________.

Specificity of the enzyme

Affinity of the enzyme for its substrate

Rate of the reaction

9 / 40

Enzyme activity is affected by ____________.

Substrate concentration

Temperature

10 / 40

Enzymes are ____________.

Lipid molecules

Nucleic acids

Biological catalysts

11 / 40

The specific region of an enzyme where substrates bind is called the ____________.

Active site

Inactive site

Reaction site

12 / 40

The rate at which an enzyme catalyzes a reaction can be affected by ____________.

Temperature

Substrate concentration

13 / 40

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

Kcat (catalytic constant)

Vmax (maximum velocity)

Km (Michaelis constant)

14 / 40

Enzymes are specific to their substrates due to ____________.

pH level

Shape complementarity

Chemical bonds

15 / 40

Which of the following is NOT true about enzyme kinetics?

Enzyme activity can be regulated

Enzyme kinetics describe the rate of enzyme-catalyzed reactions

Enzymes are consumed in the reaction

16 / 40

What is the effect of increasing substrate concentration on enzyme activity in a non-saturated system?

No effect

Increases

Decreases

17 / 40

What type of enzyme inhibition occurs when the inhibitor binds to a site other than the active site, altering the enzyme's shape?

Allosteric

Competitive

Non-competitive

18 / 40

Which of the following statements about enzyme-substrate complexes is true?

They form temporarily

They involve covalent bonds

They have higher activation energy

19 / 40

Which of the following is NOT a characteristic of enzyme catalysis?

Enzymes are consumed in the reaction

Enzymes are highly specific

Enzymes are unaffected by pH and temperature

20 / 40

Which of the following is NOT a factor that can denature enzymes?

Temperature

Substrate concentration

21 / 40

What is the function of coenzymes in enzyme-catalyzed reactions?

Inhibit enzyme activity

Assist enzymes in catalysis

Provide structural support

22 / 40

Which of the following is NOT true about enzyme-substrate complexes?

They are temporary

They are rigid structures

They involve covalent bonds

23 / 40

Which of the following is NOT a type of enzyme inhibition?

Feedback inhibition

Activation inhibition

Allosteric inhibition

24 / 40

What is the name of the model that describes enzyme-substrate interactions as a rigid lock-and-key fit?

Substrate specificity model

Induced fit model

Lock and key model

25 / 40

The rate of an enzyme-catalyzed reaction increases with ____________.

Increasing substrate concentration

Decreasing temperature

Decreasing pH level

26 / 40

The substance upon which an enzyme acts is called the ____________.

Product

Catalyst

Substrate

27 / 40

What is the effect of increasing substrate concentration on enzyme activity in a saturated system?

Decreases

No effect

Increases

28 / 40

Which of the following factors can affect enzyme activity?

Temperature

pH level

Substrate concentration

29 / 40

Which of the following is NOT a type of enzyme inhibition?

Competitive

Non-competitive

Activation

30 / 40

Enzymes are typically named by adding the suffix ____________ to the substrate they act upon.

-ose

-ine

-ase

31 / 40

Non-competitive inhibition involves the inhibitor binding to the enzyme at the ____________.

Substrate binding site

Allosteric site

Active site

32 / 40

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

Km (Michaelis constant)

Vmax (maximum velocity)

Kcat (catalytic constant)

33 / 40

What is the name of the model that describes enzyme-substrate interactions as induced fit?

Substrate specificity model

Lock and key model

Induced fit model

34 / 40

Enzymes lower the activation energy required for a chemical reaction to proceed by ____________.

Stabilizing transition states

Increasing the concentration of reactants

Providing an alternative pathway

35 / 40

Which of the following is NOT a type of enzyme inhibition?

Activation

Competitive

Non-competitive

36 / 40

Enzyme activity is typically highest at the ____________ pH for that enzyme.

Acidic

Basic

Optimal

37 / 40

What is the term for the substance that inhibits an enzyme by binding to the active site?

Competitive inhibitor

Non-competitive inhibitor

Allosteric inhibitor

38 / 40

In competitive inhibition, the inhibitor molecule binds to the ____________.

Active site

Allosteric site

Substrate

39 / 40

Enzymes function by ____________ substrates into products.

Catalyzing

Hydrolyzing

Polymerizing

40 / 40

What is the effect of increasing substrate concentration on enzyme activity in a saturated system?

Decreases

No effect

Increases

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AdminApril 5, 2024

0 17 1 minute read