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1 : Primarily, all enzymes are:

1 : Nucleic acids

2 : proteins

3 : Carbohydrates

4 : Lipids

2 : How does increasing temperature affect enzymes activity?

1 : Increase activity to a point

2 : Always decreases activity

3 : Make enzymes non-functional

4 : No effect on enzyme

3 : An enzyme works best at a pH of 7.4 placed in an acid solution with a pH of 4.0. How will this affect it?

1 : The active side will modified reducing substrate binding

2 : The enzyme will catalyze reaction faster due to increase H ions.

3 : The enzyme will again additional active sites

4 : The substrate will become inactive in an acids environment

4 : Enzymes are specific in their action because:

1 : Their active sites fit specific substrates.

2 : They are always proteins

3 : They are consumed in reactions

4 : They work only at high temperature

5 : What is true according to the induced fit model of enzyme action?

1 : Enzyme active site change shape to bind the substrate

2 : Substrate changes shape to bind to active site

3 : No shape changes occur in active site or substrate

4 : Substrate attached the enzyme at a site other that active site

6 : What is true about the optimum pH values of the following system?

1 : Pepsin works at low pH while trypsin works at high pH

2 : Both work at high pH

3 : Both work at low pH

4 : Pepsin works at high pH while trypsin works at low pH

7 : Prosthetic groups are:

1 : Required by all enzymes

2 : Proteins in nature

3 : Loosely attached with enzymes

8 : What can happen if an enzyme is exposed to temperature higher than its optimal temperature?

1 : Enzyme activity rate will increase

2 : Enzyme shape will change potentially its activity

3 : Enzyme will become a substrate itself

9 : Which best defines an enzyme?

1 : A chemical that break down food

2 : A hormone that regular metabolism

3 : A molecule that stores energy

10 : How does competitive inhibitor affect enzyme action?

1 : Attach with the substrate

2 : Changes enzymes shape

3 : Attaches and blocks the active site

4 : Blocks the cofactors

11 : Which best defines an enzyme?

1 : A chemical that breaks down food

2 : A hormone that regular metabolism

3 : A protein that speed up reaction

4 : A molecular that stores energy

Biology 9th MCQs || Ilam Ghar