First slide

The DNA

Question

Identify the correct statement:

Easy

A

The length of DNA is measured with respect number of hydrogen bonds in the DNA.
B

The length of DNA varies from species to species
C

Length of DNA of human genome is 6.6 × 10⁹ bp.
D

Bacteriophage lambda has 5386 base pairs.

Solution

Length of DNA is the characteristic of an organism. E.g., Bacteriophage φ ×174 has 5386 nucleotides, Bacteriophage lambda has 48502 base pairs (bp), Escherichia coli has 4.6 × 10⁶ bp, and haploid content of human DNA is 3.3 × 10⁹ bp.
DNA is a long polymer of deoxyribonucleotides. The length of DNA is measured in terms of number of nucleotides if DNA is single stranded in an organism or nucleotide or base pairs if the organism has double stranded DNA.

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