Which of the following is a protein? A. Natural rubber B. Starch C. Cellulose D. None of these

Natural rubber
Starch
Cellulose
None of these

The correct answer is D. None of these.

Proteins are large, complex molecules that are essential for life. They are made up of amino acids, which are linked together in a chain. The sequence of amino acids in a protein determines its structure and function. Proteins are found in all living things, and they perform a wide variety of essential functions, including:

  • Building and repairing tissues
  • Enzymes that catalyze chemical reactions
  • Hormones that regulate body functions
  • Antibodies that fight infection

Natural rubber is a polymer of isoprene, a type of terpene. It is a natural product that is found in the latex of many plants, including rubber trees. Starch is a polysaccharide that is made up of glucose units. It is a major source of energy for plants and animals. Cellulose is a polysaccharide that is made up of glucose units. It is the main structural component of plant cell walls.

None of these substances are proteins.