Nitrogen is a constituent of

Options :
  1. protein
  2. cell wall
  3. protoplasmic membrane
  4. starch
Answer and Explanation :-

Answer: Option 1

Explanation:

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Though I do not believe that a plant will spring up where no seed hasbeen, I have great faith in a seed. Convince me that you have a seedthere, and I am prepared to expect wonders.
-Henry David Thoreau