The sequence in which amino acids are linked to one another in a protein molecule is called its:

Options

A. quaternary structure
B. tertiary structure
C. secondary structure
D. primary sturcture

Answer

D

Explanation

Proteins many have one or more polypeptide chains. Each polypeptide in a protein has `alpha`-amino acids linked with each other in a specific sequence and it is this sequence of amino acids that is said to be the primary structure i.e., the sequence of amino acids creates a different protein.
For a polypeptide containing 20 different amino acids, each occuring once in the chain, the number of different amino acid sequences, i.e., primary sturctures is 20 ! (factorial twenty).
A protein containing a total of 100 amino acid residues is a very small protein, yet 20 different amino acid can be combined at one time in `(20)^(100)` different ways.