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Fab fragments of an antibody molecule ar...

`F_ab` fragments of an antibody molecule are made up of:
1) Variable regions of only the light chains at N-terminal end
2) Constant regions of only the heavy chains at C-terminal end
3) Variable regions of both heavy and light chains at N-terminal end
4) Constant regions of both heavy and light chains at C-terminal end

A

Variable regions of only the light chains at N-terminal end

B

Constant regions of only the heavy chains at C-terminal end

C

Variable regions of both heavy and light chains at N-terminal end

D

Constant regions of both heavy and light chains at C-terminal end

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