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प्रश्न
What are the protruding and hanging stretches of DNA produced by these restriction enzymes called? Describe their role in the formation of rDNA.
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उत्तर
The DNA strand is cut by restriction enzymes between the similar two bases on the opposing strands, but just outside of the palindromic sites: The enzyme cuts both the foreign DNA and the vector DNA similarly. Only when the DNA sequence GAATTC is present does EcoRI cut the DNA between the nucleotides G and A. As a result, there are single-stranded, overhanging lengths at the end that are known to as sticky ends. Hydrogen bonds are formed between sticky ends and their complementary sliced opposites. The DNA ligase enzyme's function is made easier by the end's stickiness. Recombinant DNA was created as a result.
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संबंधित प्रश्न
Explain with the help of a suitable example the naming of a restriction endonuclease.
How are 'sticky ends' formed on a DNA strand? Why are they so called?
Make a chart (with diagrammatic representation) showing a restriction enzyme, the substrate DNA on which it acts, the site at which it cuts DNA and the product it produces.
Restriction enzymes ______.
A specific recognition sequence identified by endonucleases to make cuts at specific positions within the DNA is ______
In agarose gel electrophoresis, DNA molecules are separated on the basis of their ______.
A plasmid DNA and a linear DNA (both are of the same size) have one site for a restriction endonuclease. When cut and separated on agarose gel electrophoresis, plasmid shows one DNA band while linear DNA shows two fragments. Explain.
How are DNA fragments visualised once they are separated by gel electrophoresis?
During agarose gel electrophoresis, why do DNA fragments migrate toward the anode (positive electrode)?
Why are Type II restriction endonucleases the primary class of restriction enzymes used in genetic manipulation?
