AP BIOLOGY

Detailed explanation-1: -Protein plays a key role in helping to repair and strengthen muscle tissue after exercise. Although protein is critical for building muscle, to maximise the benefits it should be considered in the context of the whole diet, which includes the right amount of carbohydrates, fats, vitamins and minerals.

Detailed explanation-2: -Proteins are the end products of the decoding process that starts with the information in cellular DNA. As workhorses of the cell, proteins compose structural and motor elements in the cell, and they serve as the catalysts for virtually every biochemical reaction that occurs in living things.

Detailed explanation-3: -The protein acts as a chemical messenger for the interaction between cells, tissues, and organs. Regeneration and creation of DNA molecules are done with the help of proteins. Receptors are made up of proteins that help in the interaction of a cell with other cells and the external environment.