The bacteria (prokaryotes) contain special types of enzymes called the restriction enzymes. These enzymes are responsible for cleaving the viral DNA that enters the bacterial cell for the infection, thereby restricting the growth of the virus particles. Therefore, these are nucleases. These do not degrade the DNA of the bacterial cell because the DNA is protected by methylation. Due to their specific cleaving activity, the restriction enzymes are widely used in rDNA technology.
Hence, the correct answer is 'Prokaryotes'
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Similar Questions
Q1
Restriction enzymes are isolated chiefly from ?
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Q2
From which of the following the restriction enzymes were originally isolated?
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Q3
How many of the following statements regarding restriction enzymes are correct?
A. They generally recognise palindromic nucleotide sequences.
B. They are endonucleases.
C. They are isolated from viruses.
D. A particular restriction enzyme produces the same kind of sticky or blunt ends in any DNA molecules.
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Q4
Select the option which gives correct name for the restriction enzyme isolated from Haemophilus
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Q5
A plasmid having a recognition sequence of 5' GGATCC 3' is recognised by the restriction enzyme isolated from