Catalysts produced by living cells in small amounts are known as:

Assertion $(A)$: All enzymes are made of proteins.
Reason $(R)$: All proteins act as enzymes.

Enzymes are best defined as

Enzymes that catalyse the removal of groups from substrates by mechanisms other than hydrolysis,leaving double bonds,are known as:

Which of the following acts as an enzyme?

During an enzymatic reaction,the nature of the transition state of the substrate is -