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DNA is a long polymer of deoxyribonucleotides. The length of DNA is usually defined as number of nucleotides (or a pair of nucleotide referred to as base pairs) present in it. This is also the characteristic of and organism. For example, a bacteriophage known as × 174 has 5386 nucleotides, Bacteriophage lambda has 48,502 base pairs (bp), Escherichia coli has 4.6 × 106 bp, and haploid content of human DNA is 3.3×109 bp.
(i) What is the monomer unit of DNA ? (a) Ribose Sugar (b) Deoxyribonucleotides (c) Nucleotide (d) Ribonucleotide(ii) How many nucleotides are there in bacteriophage lambda ? (a) 5386 nucleotide (b) 48,502 bp (c) 4.6 × 10 6 bp (d) 10 9 bp(iii) What is the length of haploid DNA in human ? (a) 1.1 cm (b) 1.1 m (c) 2.2 m (d) 1.36 mm(iv) How many base pairs are there in the E-coli DNA ? (a) 4.6 × 10 9 bp (b) 4.6 × 10 6 bp (c) 5386 bp (d) 48,502 bp

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