Proteins are an integral part of-

Correct option is B

The correct answer is (b) All of the options.
· Proteins play crucial roles in various cellular and physiological processes.
Cell membrane:
· Proteins are essential components of the cell membrane. They are involved in functions such as transport, cell signaling, and maintaining the structure of the membrane. Membrane proteins include integral proteins that span the membrane and peripheral proteins that are attached to the exterior or interior surfaces.
Antibodies:
· Antibodies are proteins produced by the immune system to identify and neutralize foreign objects like bacteria and viruses. They are highly specific to the antigens they bind to and are a key component of the body's immune response.
Enzymes:
· Enzymes are proteins that act as biological catalysts, speeding up chemical reactions in the body. They are vital for metabolic processes and are specific to the substrates they act upon.
Therefore, proteins are integral parts of cell membranes, antibodies, and enzymes, making them fundamental to various biological functions.