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What do the letters N and C in the antibody diagram of NCERT mean?

Dear student.

N and C are two terminal present in an antibody or peptide. N designates amino-terminus (NH2),  C-terminus is known as carboxyl-terminus, where free -COOH group is present. A protein(antibody) starts from N-terminus and ends in C-terminus. 

Regards.

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Like how a DNA has 2 terminals - 5' an 3', An Antibody molecule also has 2 terminals which is denoted by N and C.
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Hope the image is clear to u....
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The C region (constant region) is the one which differentiates an antibody from a B cell receptor. The N region helps the antibody to interact with the antigen.
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