Which is NOT a function of proteins? (Choose only ONE answer.)
1)working in the immune system
2)providing energy
3)working as enzymes
4)building muscle

1. working in the immune system.

Explanation:

Proteins are responsible for the development of hairs, skin, wool, and nails in our body. Meat, eggs, and fish are some of the rich food sources of proteins. Enzymes are proteins made up of amino acids and acts as biological catalysts in our body. However, glucose serves the purpose of energy provider for the metabolism which is not a protein.

answer; a muscle cell, another neuron and a of the above