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Q.
'Restriction' in restriction enzyme refers to
Biotechnology : Principles and Processes
Solution:
A restriction enzyme is an enzyme that cuts $DNA$ at or near a specific recognition nucleotide sequences known as restriction sites. These enzymes are found in bacteria and provide a defense mechanism against invading virus. Inside a prokaryote, the restriction 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 processes form restriction modification system.