Question

38 multiple choice 1 point plasmid dna instead of genomic dna was used in our lab analysis mainly because, plasmid dna has more restriction sites. plasmid dna is smaller so it generates discrete bands for ease of analysis. plasmid grows in bacteria cells. plasmid dna generate different restriction patterns from genomic dna.

Explanation:

To determine the correct answer, we analyze each option:

• Option 1: Plasmid DNA typically has fewer restriction sites than genomic DNA (which is large and complex), so this is incorrect.
• Option 2: Plasmid DNA is smaller in size compared to genomic DNA. Smaller DNA molecules produce more distinct, discrete bands during analysis (e.g., gel electrophoresis), making it easier to interpret results. This aligns with lab analysis goals.
• Option 3: While plasmids are found in bacterial cells, this fact alone doesn’t explain why they’re used over genomic DNA for analysis. The focus is on analytical utility, not just their location.
• Option 4: The key reason for using plasmid DNA isn’t about “different” restriction patterns in a vague sense, but about the practicality of analysis (size leading to discrete bands). So this is not the main reason.

Answer:

B. Plasmid DNA is smaller so it generates discrete bands for ease of analysis.