Question
a.
By methylation of bacterial DNA by restriction enzyme
b.
By methylation of foreign DNA by restriction enzyme
c.
By phosphorylation of bacterial DNA by restriction enzyme
d.
By phosphorylation of foreign DNA by restriction enzyme
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Q. The restriction endonuclease is having a defence mechanism in the bacterial system against foreign DNA such as viruses. But how it is able to protect its own DNA?
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Q. Even after replication, how the modified DNA remains protected?
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Q. A sequence is having two ends, 5’ and 3’. Which of the following statements is correct regarding the nature of the ends?
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Q. The recognition sequence of Sau3A is 5’ |GATC 3’ and that for DpnI is 5’ GA|TC 3’. Which of the statements is true?
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Q. If all the nucleotides are present with equal frequencies and at random, what are the chances of having a particular four nucleotide long motif?
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Q. Isocaudomers are defined as the enzymes which recognize different sequence but generate same ends. Which of the following pairs of enzymes can be termed as isocuadomers?
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Q. The specificity of an enzyme is affected by the concentration of buffer used. This phenomenon is termed as:
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