First slide

Proteins

Question

Statement I ; All proteins are poly peptides
Statement II ; All poly peptides are proteins

Easy

A

Statements I and II are correct
B

Statement I is correct and statement II is incorrect
C

Statement I is incorrect and statement II is correct
D

Statements I and II are incorrect

Solution

Peptide bond formation;
$- COOH + H_{2} N - \overset{- H_{2} O}{\to} - CO - NH - (peptide linkage);$
Condensation of $α -$ amino acids involves loss of water molecules ;
-OH from $- COOH$ and -H from $- {NH}_{2}$ lose as water;
Number of peptide linkages= n-1 (n=number of amino acid residues)
Thus condensation of
a) two amino acids(one peptide bond) gives a dipeptide
b) three amino acids(two peptide bonds) gives a tripeptide
c) 2-10 amino acids gives oligo peptides
d) >10 amino acids gives a poly peptides
e) If the molecular weight of a poly peptide is equal to greater than 10,000u containing a minimum of 100 amino acid residues, it is a protein;
f) Thus all proteins are poly peptides but the reverse is not always true

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