Biology 9 Chapter 6 MCQs Tests

In this post, we have prepared 2 MCQs tests of Federal Board Biology 9 Chapter 6 MCQs Tests. For more Class 9 Biology MCQs Tests visit this page.

Biology 9 Chapter 6 MCQs Tests

Practice MCQs Test No 1

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Class 9 Biology
Chapter 6
Practice MCQs Test No 1

1 / 15

If organic cofactors are tightly bound to enzyme, they are called:

Prosthetic groups

None of these

Both a & b

Coenzymes

2 / 15

The concept of metabolism was first of all given by:

Ibn-e-Nafees

Daniel Koshland

Emil Fischer

Winhelm Kuhne

3 / 15

Who first time used the term enzyme?

Daniel Koshland

Emil Fischer

lbn-e-Nafees

Winhelm Kuhne

4 / 15

If organic cofactors are loosely attached with enzyme, they are called:

Both a & b

None of these

Coenzymes

Prosthetic groups

5 / 15

The molecules on which enzymes act are called:

Co-enzyme

Proteins

Substrates

Enzyme substrates complex

6 / 15

When the term enzyme was used for the first time?

1876

1878

1874

1880

7 / 15

Chemically enzymes are:

Fats

Carbohydrates

Protein

Lipids

8 / 15

Almost all the enzymes are:

Carbohydrates

Fats

Protein

Vitamins

9 / 15

The term metabolism is derived from:

Latin Word

French word

Greek word

Italian word

10 / 15

Which of the following is not true about enzymes?

They increase the activation energy

Enzymes speed up biochemical reactions

They lower the activation energy

They act as biocatalysts

11 / 15

Which one is an organic cofactor?

Flavin

Heme

None of these

Both a & b

12 / 15

The term Metabolism is derived from the Greek words means:

Break

Division

Split

Change

13 / 15

The catalytic region of enzyme is called:

Active site

Prosthetic group

Coenzyme

Cofactor

14 / 15

Enzymes lower the activation energy in the ways:

They may alter the shape of substrate

All of these

They may lower activation energy by bringing substrates in the correct orientation to react

Some enzymes do so by disrupting the charge distribution on substrates

15 / 15

To which group of molecules enzymes belong?

Nucleic acids

Lipids

Proteins

Carbohydrates

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Practice MCQs Test No 2

/14

50

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Class 9 Biology
Chapter 6
Practice MCQs Test No 2

1 / 14

Starch is broken down by an enzyme called:

Lipase

Pepsin

Amylase

All of these

2 / 14

When there is an increase in temperature, the rate of enzyme catalyzed reactions:

Decreases

All of these

Remains constant

Increases

3 / 14

Which of the following vitamins act as coenzyme?

Thiamine

All of these

Folic acid

Riboflavin

4 / 14

The enzyme that acts on lipids:

Protease

Amylase

Pepsin

Lipase

5 / 14

Number of discovered enzymes so far:

1500

2500

2000

1000

6 / 14

Who proposed induced-fit model?

Emil Fischer

Daniel Koshland

Winhelm Kuhne

Ibn-e-Nafees

7 / 14

When was induced-fit model proposed?

1958

1956

1954

1952

8 / 14

Which enzymes are used in dish washing to remove resistant starch residues?

Protease

Lipase

Amylase

All of these

9 / 14

When was lock and key model proposed?

1894

1896

1890

1898

10 / 14

The enzymes used for the removal of protein stains from clothes?

Protease

All of these

Amylase

Lipase

11 / 14

Which of the following is not true about induced fit model?

Active site is molded into the required shape.

It is more acceptable model

According to this model active site is not rigid structure

This model explains specificity of enzymes

12 / 14

The peptide bonds in proteins are broken down by:

Amylase

Protease

All of these

Lipase

13 / 14

Who proposed lock and key model?

Emil Fischer

Daniel Koshland

Ibn-e-Nafees

Winhelm Kuhne

14 / 14

The optimum temperature for the maximum working speed of human enzymes is:

37°C

43°C

39°C

35°C

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