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Biomolecules

Question

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Which bonds in the backbone of a peptide can rotate freely and which cannot? Give reasons.

Solution

The rotation is not allowed in the peptide bond. The free rotation of a peptide chain can only occur around the bonds joining the nearly planar amide groups to the α-carbons. The free rotation about the peptide bond is respected due to the partial double bond character of the C—N bond in peptide linkage. Therefore, —CONH—group is planar and rigid.

Some More Questions From Biomolecules Chapter

What is a biomoiecule?

Define carbohydrates.

Give one example each of (i) Reducing sugar and (ii) Non-reducing sugar.

Name the anomers of glucose.

State two characteristics of monosaccharides.

Name a carbohydrate containing five carbon atoms per molecule.

Name the monomers of starch.

Name the polysaccharides that is stored in the liver of animals.

What do you understand by the term gycosidic linkage?

What are the hydrolytic products of lactose?

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