MCQ
Proteins are built up of
- ADicarboxylic acids
- ✓Amino acids
- CAlcohols
- DHydroxy acids
Amino acid $\to$ Dipeptide $\to$ Polypeptide $\to$ Protein.
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$(I)$ They have high melting points, higher than those of pure metals
$(II)$ They are very hard
$(III)$ They retain metallic conductivity
$(IV)$ They are chemically more reactive than the pure metals