Question

Proteins are composed of.
A. Amino acids.
B. Carbohydrates.
C. Vitamins.
D. Mineral salts.

Answer 1

Hint: We know that Proteins are large, complex molecules which play various significant roles in the body. The works in cells are done by the proteins and they are essential for the structure, function, and regulation of the body's tissues and organs.
We must remember that the proteins are built up by thousands of smaller units called amino acids and they are attached in long chains. There are 20 types of amino acids and they combine to make a protein.

Complete step by step answer: As we know,
-Proteins are made up of amino acids which are combined by peptide bonds.
-Amino acids connected by peptide bonds are referred to as polypeptide chains and upwards of 30–50 amino acids connected called proteins.
-The basic structural formula of all amino acids is the same but they have a different side chain and it is denoted by the letter R.
-There is a carboxyl group at one end of the protein that takes care of the acid part of amino acid and the other end amine group is present.
So, the correct answer is “Option A”.

Note: Now we can discuss the structure of protein: Proteins have four levels of an organization.
-The linear arrangement of amino acids is the primary level of protein.
-The folding or aligning of proteins to get repeating patterns is the secondary organization of protein. -There are two types of patterns; they are the alpha helix and the beta-pleated sheet.
-The third level of the protein involves the interactions of the side chains through covalent bonding, hydrogen bonding, salt bridges, hydrophobic interactions, and metal ion coordination.
-The fourth level has more than one polypeptide chain and its succeeding interactions.