Question:
Statement 1: Plasmid DNA is circular
Statement 2: Plasmid possess single stranded DNA without polarity
Statement 1: Plasmid DNA is circular
Statement 2: Plasmid possess single stranded DNA without polarity
Statement 2: Plasmid possess single stranded DNA without polarity
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Plasmids are usually circular, double-stranded DNA molecules used as vectors in genetic engineering.
Updated On: Jul 18, 2026
- Statement 1 is true and statement 2 is false.
- Statement 2 is true and statement 1 is false.
- Both statements are false.
- Both statements are true.
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The Correct Option is A
Solution and Explanation
Step 1: Understanding plasmid DNA structure.
Plasmids are extra-chromosomal genetic elements commonly found in bacteria. They are usually double-stranded, circular DNA molecules that replicate independently of chromosomal DNA.
Step 2: Evaluation of Statement 1.
Statement 1 says plasmid DNA is circular. This is correct because most plasmids exist as circular double-stranded DNA molecules.
Step 3: Evaluation of Statement 2.
Statement 2 says plasmids possess single-stranded DNA without polarity. This is incorrect because plasmids are generally double-stranded DNA and DNA inherently has polarity due to its 5’ and 3’ ends.
Step 4: Biological clarification.
The structural stability and replication mechanism of plasmids depend on their double-stranded circular nature, which allows independent replication in bacterial cells.
Step 5: Final conclusion.
Thus, Statement 1 is true and Statement 2 is false.
Plasmids are extra-chromosomal genetic elements commonly found in bacteria. They are usually double-stranded, circular DNA molecules that replicate independently of chromosomal DNA.
Step 2: Evaluation of Statement 1.
Statement 1 says plasmid DNA is circular. This is correct because most plasmids exist as circular double-stranded DNA molecules.
Step 3: Evaluation of Statement 2.
Statement 2 says plasmids possess single-stranded DNA without polarity. This is incorrect because plasmids are generally double-stranded DNA and DNA inherently has polarity due to its 5’ and 3’ ends.
Step 4: Biological clarification.
The structural stability and replication mechanism of plasmids depend on their double-stranded circular nature, which allows independent replication in bacterial cells.
Step 5: Final conclusion.
Thus, Statement 1 is true and Statement 2 is false.
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