Question

Which of the following constitutes the primary structure of a protein?
A. The folding of a polypeptide chain
B. The linear sequence of amino acids in a polypeptide chair
C. The polypeptide chains stacked on top of each other
D. A pleated sheet
E. Several polypeptide subunits

Answer 1

B. This is because this is the most simple structure of a protein

Answer 2

Answer: B. The linear sequence of amino acids in a polypeptide chain.

Explanation: Protein structure is the  three dimensional arrangement of amino acid molecules in polypeptide chain.  

Protein has four types of structure -

1-Primary structure

2-secondary structure

3- Tertiary structure

4- Quaternary structure

Primary structure of protein is the simplest form of protein where amino acids are arranged in linear way. One end of polypeptide chain is Called C-terminal (Carboxyl group )and other is called N terminal (amino group). Peptide bods play important role in establishing primary structure of protein.