Class 9 MCQs Tests

Biology 9 Chapter 6 Practice Test 3

ByMuhammad Zaman January 8, 2022October 29, 2022

/10

Class 9 Biology
Chapter 6
Practice MCQs Test No 3

1 / 10

Enzymes lower the activation energy in the ways:

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

All of these

They may alter the shape of substrate

2 / 10

When was induced-fit model proposed?

1958

1952

1954

1956

3 / 10

The enzyme that acts on lipids:

Amylase

Protease

Pepsin

Lipase

4 / 10

The peptide bonds in proteins are broken down by:

Amylase

Lipase

Protease

All of these

5 / 10

Who proposed induced-fit model?

Emil Fischer

Ibn-e-Nafees

Winhelm Kuhne

Daniel Koshland

6 / 10

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

Active site is molded into the required shape.

According to this model active site is not rigid structure

It is more acceptable model

This model explains specificity of enzymes

7 / 10

Number of discovered enzymes so far:

1000

2000

1500

2500

8 / 10

Starch is broken down by an enzyme called:

Pepsin

Amylase

Lipase

All of these

9 / 10

Who proposed lock and key model?

Daniel Koshland

Winhelm Kuhne

Ibn-e-Nafees

Emil Fischer

10 / 10

When was lock and key model proposed?

1890

1894

1898

1896

Your score is

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