$$\alpha $$-carbon of $$\alpha $$-amino acid is asymmetric.

All proteins are found in $$L$$-form

Human body can synthesise all proteins they need.

At pH = 7 both amino and carboxylic groups exist in ionised form.

edible proteins

proteins with specific structure

nitrogen containing carbohydrates

carbohydrates.

Starch is a polymer of $$\alpha $$-glucose.

Amylose is a component of cellulose.

Proteins are composed of only one type of amino acid.

In cyclic structure of fructose, there are four carbons and one oxygen atom.

C $$-$$ N bond length in proteins is longer than usual bond length of N $$-$$ C bond.

Spectroscopic analysis shows planar structure of group.

C $$-$$ N bond length in proteins is smaller than usual bond length of C $$-$$ N bond.

None of the above.