In recombinant DNA technology used to commercially synthesize human insulin, which bacterial structure serves as the vector to carry the human insulin gene into host cells?
Answer and explanation
Correct answer: D. Bacterial plasmid
- Step 1: Recall vector systems in genetic engineering: a vector is a DNA molecule used as a vehicle to artificially carry foreign genetic material into another cell.
- Step 2: Bacterial plasmids are small, circular, double-stranded extrachromosomal DNA molecules that can be cleaved with restriction enzymes and ligated with target genes.
Answer
Bacterial plasmid.
Why not the others: 'Ribosomal RNA' catalyzes protein translation and cannot replicate or carry recombinant genes; 'Peptidoglycan cell wall' provides structural rigidity to the bacteria; 'Flagellar basal body' is a motor protein assembly for bacterial motility.
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