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Restriction' in restriction enzyme refer...

Restriction' in restriction enzyme refers to

A

a) cleaving of phosphodiester bond in DNA by the enzyme

B

b) cutting of DNA at specific position only

C

c) prevention of the multiplication of bacteriophage in bacteria

D

d) all of the above

Text Solution

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The correct Answer is:
C
A restriction enzyme is an enzyme that cuts DNA at or near a specific recongnition nucleotide sequences known as restriction sites. These enzymes are found in bacteria and provide a defense mechanism against invading virus. Inside a prokaryote, the restraction enzyme cuts up foreign DNA in a process called 'restriction' while host DNA is protected by a modification enzyme that modifies the prokaryotic DNA and blocks cleavage. Together, these processess form restriction modification system.
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