NEET-XII-Physics
Previous Year Paper year:2017
- #145Following statements describe the
characteristics of the enzyme Restriction
Endonuclease. Identify the incorrect
statement.
(1) The enzyme cuts DNA molecule at
identified position within the DNA.
(2) The enzyme binds DNA at specific sites
and cuts only one of the two strands.
(3) The enzyme cuts the sugar-phosphate
backbone at specific sites on each strand.
(4) The enzyme recognizes a specific
palindromic nucleotide sequence in the
DNA.digAnsr: 2Ans : ( 2 )
Sol. Restriction enzymes cut DNA molecules at a
particular point by recognising a specific
sequence. 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 backbone.