Practicing Success

Target Exam

CUET

Subject

Biology

Chapter

Reproduction in Organisms

Question:

Restriction enzymes belong to a larger class of enzymes called nucleases. These are of two kinds; exonucleases and endonucleases. Exonucleases remove nucleotides from the ends of the DNA whereas, endonucleases make cuts at specific positions within the DNA. Each restriction endonuclease functions by ‘inspecting’ the length of a DNA sequence. Once it finds its specific recognition sequence, it will bind to the DNA and cut each of the two strands of the double helix at specific points in their sugar -phosphate backbones. Each restriction endonuclease recognises a specific nucleotide sequences in the DNA.

Which statement is correct about endonuclease?

Options:

Removes nucleotide from the ends of DNA

Add the nucleotide at the end of DNA

Cuts deoxiribonucleotide at specific position

Cuts ribonucleotide at specific position

Correct Answer:

Removes nucleotide from the ends of DNA

Explanation:

The correct answer is Option () →