Question

Which statement about enzymes is true?
An enzyme functions to increase the activation energy in a reacton.
Enzymes are proteins that function as catalysts in nonliving things.
Each enzyme can catalyze many different biochemical reactions.
Enzymes and substrates fit together like a lock and key.

Answer 1

Explanation:

3 rd option is suitable...✌✌

Answer 2

The correct answer is Enzyme and substrate fit together like a lock and key.

Explanation:

• Enzymes are responsible for speeding up a biochemical reaction by lowering the activation energy barrier.
• An enzyme shows specificity for a particular biochemical reaction and this is where it differs from a catalyst.
• Enzymes are proteins that can act as catalysts in living organisms.
• The enzyme is highly specific for its substrate and this is expressed by the Lock and Key hypothesis of enzyme-substrate interaction.
• The active site of an enzyme, that is, the region of the enzyme which interacts with the substrate, has a conformation or structure which is exactly complementary to the structure of the substrate.
• This way the enzyme binds specifically to the substrate and help in speeding up the reaction.