1. Basic unit = amino acid
2. Elements = CHOSN P (chosen 'P') - carbon, hydrogen, oxygen, sulphur, nitrogen, & phosphorus.
3. There are 20 types of natural amino acids.
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4. Two types of amino acid - Essential & Non-essential
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5. Amino acid is an amphoteric molecule (having both acid & base features)
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To be continued in Part 2...