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Question
Biology
Posted 10 months ago
Differentiate between uncut plasmid and cut plasmid
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Answer from Sia
Posted 10 months ago
Answer
The main difference between an uncut plasmid and a cut plasmid is that an uncut plasmid is a circular DNA molecule that has not been cleaved by restriction enzymes, while a cut plasmid has been opened up at specific sites by these enzymes.
Solution
a
Uncut Plasmid: :
This is a circular DNA molecule that is fully intact with no breaks in the phosphate-sugar backbone. It is often supercoiled and exists in a natural state within a bacterial cell or in a plasmid preparation
b
Cut Plasmid: :
A cut plasmid has been treated with restriction enzymes, which recognize specific DNA sequences and cleave the DNA at or near these sites. This results in linearized plasmid DNA or plasmids with 'sticky' or 'blunt' ends, depending on the enzyme used
Key Concept
Restriction enzymes and their role in cutting plasmids
Explanation
Restriction enzymes are molecular scissors that cut DNA at specific sequences, which is the key difference between uncut and cut plasmids. Cut plasmids are used in various molecular biology techniques, such as cloning, where foreign DNA can be inserted at the cut sites.

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