Interpretation:
The number of amino acids and peptide bonds present in the following peptide should be determined.
Concept introduction:
Proteins are
They polymerise by peptide linkage to form dipeptide, oligopeptide and polypeptide molecules. Each peptide bond formation is a condensation reaction that occurs with the elimination of water molecule.
Answer to Problem 50A
Four amino acids and three peptide bonds (amide groups −CONH2) are present.
Explanation of Solution
A
The given structure is:
In above structure, four different amino acids are present due to the presence of three peptide bonds. Peptide bonds are identified by the bonding present between carboxyl group of one amino acid and amino group of another amino acid. Three amide groups are present in the given structure and the amino acids present on end of the chain (both side) is not bonded to any group.
The structure is shown as:
Thus, in the given structure: Four amino acids and three peptide bonds (amide groups −CONH2) are present.
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