Solved MCQs of Biology Class 9 Chapter 6

When we add more substrate to an already occurring enzymatic reaction and there is no increase in the rate of reaction what would you predict?

All active sites have been occupied by substrate molecules

The enzyme molecules have denatured

More substrate acted as inhibitor

More substrate has disturbed the pH of the medium

Which enzyme works in stomach?

Lipase

Trypsin

Pepsin

Amylase

Which one of the following convert lipids to fatty acids?

Protease

Lipase

Both

None

All enzymes are composed of:

Lipids

Carbohydrates

Proteins

Phosphates

Metabolism is of …………… types.

1

2

3

4

Non-protein part of enzymes are:

Inhibitors

Substrate

Cofactors

Coenzymes

Denaturation of enzyme is caused by:

Increased pH

Decreased pH

Increases in temperature above optimum temperature

Decreases in temperature

Which one of the following convert protein to amino acids?

Protease

Lipase

Both

None

Enzymes are made up of …………. .

protein

Carbohydrates

Lipids

Triglyceride

Lock and key model was proposed by:

Emil Fischer

Melcher

Koshland

Saugeo