Proteins which is present in protoplasm are very important because
They provide definite shape to cell.
They function as biocatalyst.
The correct option is B They function as biocatalyst.
Proteins are the most versatile biomolecules. They have a variety of structural and functional roles. The most important functional role of proteins is biocatalysis. The biocatalytic proteins are called enzymes. Enzymes catalyse biological reactions and are indispensable for metabolism of living beings.