Question

A restriction endonuclease breaks bonds between the

• A. Base pairs of a DNA molecule
• B. Base pairs of a DNA-RNA hybrid molecule
• C. Sugar and phosphate components of a nucleic acid molecule
• D. Exons and introns of a DNA molecule

Answer 1

The correct option is C Sugar and phosphate components of a nucleic acid molecule

The restriction endonuclease enzyme inspects the length of a DNA sequence. Once it recognises specific sequence, it binds to the DNA and cuts each of the two strands of the double helix at specific points in their sugar phosphate back bone. Special sequence in the DNA recognised by restriction endonuclease is called palindromic nucleotide sequence. Restriction endonuclease enzymes are also known as molecular scissors or biological scissors or chemical knives or chemical scalpels.

So, the correct answer is 'Sugar and phosphate components of a nucleic acid molecule'.