Zoology MCQs for NEET — Practice Questions with Answers

Almost all enzymes are proteins

All enzymes are proteins except ribozymes

All enzymes are bio-catalyst

All of these

The rate doubles itself

Decreases by half

No effect

First increases then decreases

It accelerates the rate of  formation of carbonic acid by 10 million times.

In its absence only 200 molecules of carbonic acid is formed in an hour.

It forms 600,000 molecules  of carbonic acid in one second.

All of these

Catalysed reactions proceed at rates higher than that of uncatalysed ones.

In skeletal muscle under anaerobic conditions lactic acid is formed from pyruvic acid.

In yeast during fermentation ethanol is formed from pyruvic acid.

All of these

The chemical or metabolic conversion refers to a reaction.

The chemical which is converted into a product is called a substrate.

Proteins with three dimensional structures including an active site is called enzyme.

All of these

The chemical or metabolic conversion refers to a reaction.

The chemical which is converted into a product is called an enzyme.

Proteins with three dimensional structures including an active site is called enzyme.

Enzymes convert a substrate into a product.

The ES complex formation is a transient phenomenon

The structure of the substrate gets transformed into the structure of product.

All the structures formed between substrate and product are called intermediates.

All of these

The ES complex formation is a transient phenomenon

The structure of the substrate gets transformed into the structure of product.

All the structures formed between substrate and product are called intermediates.

Intermediates are highly stable.

Enzyme has a active site so that a highly reactive enzyme-substrate complex is produced.

ES complex is short lived.

The formation of ES complex is essential for catalysis.

All of these

The substrate binds to the active site of the enzyme

The binding of the substrate induces the enzyme to alter its shape.

The active site of the enzyme when it is in close proximity of the substrate breaks the chemical bonds of the substrate.

None of these