Question

The primary structure of a protein molecule has ______.

Options

• Two ends

• One end

• Three ends

• No ends

Answer 1

The primary structure of a protein molecule has two ends.

Explanation:

A protein is imagined as a line, the left end represented by the first amino acid and the right end represented by the last amino acid. The first amino acid is also called an N-terminal amino acid. The last amino acid is called the C-terminal amino acid.