Free Biomolecules (Daily Quiz: 14) NEET Biology Questions & Answers with Detailed Explanation & Full Review

Answer: (c)

The density of DNA decreases on heating as hydrogen bonds break down. According to Chargaff's rules, the amount of adenine is always equal to that of thymine and the amount of guanine is always equal to that of cytosine i.e. A = T and G = C. The base ratio A + T/ G + C may vary from species to species, but is constant for a given species.

Answer: (d)

Polysaccharides are complex long chain carbohydrates which are formed by dehydrate synthesis or polymerisation of more than 10 but generally very large number of units called monosacccharides. Starch, glycogen and cellulose are all polysaccharides. Starch is a glucosan homopolysaccharide which is the main reserve food of plants. Glycogen is also a glucosan homopoly-saccharide which is the major reserve food of fungi, animals and some bacteria. It is also called animal starch. Cellulose is the structural polysaccharide of plant cell walls, some fungi, protists. It is a fibrous glucosan homopolysaccharide of high tensile strength.

Answer: (c)

Glycine is considered as the simplest amino acid as it has one amino group, one carboxylic group and no substituent functional group. H C H NH 2 COOH

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