Question

Identify the correctly matched pair:

• A. Bt toxin- Biofertiliser
• B. Proinsulin-A peptide chain and B peptide chain
• C. Ti plasmid -Trichinella spiralis
• D. RNA interference - Silencing of mRNA

Answer 1

Answer:

D. RNA interference - Silencing of mRNA

1. Bt toxin – Biofertiliser

   • Bt toxin (from Bacillus thuringiensis) is an insecticidal protein, used in biopesticides and Bt crops, not a biofertiliser.

   • Biofertilisers are organisms like Rhizobium, Azotobacter, mycorrhiza, etc., that enhance nutrient availability.

2. Proinsulin – A peptide chain and B peptide chain

   • Proinsulin is a single polypeptide chain consisting of A chain, B chain, and a connecting C-peptide.

   • It is not “A peptide chain and B peptide chain” as separate chains; those appear only after C-peptide is removed to form mature insulin.

3. Ti plasmid – Trichinella spiralis

   • Ti plasmid (Tumour-inducing plasmid) belongs to Agrobacterium tumefaciens, a bacterium used in plant genetic engineering.

   • Trichinella spiralis is a parasitic nematode; it has no relation to Ti plasmid.

4. RNA interference – Silencing of mRNA

   • RNA interference (RNAi) is a cellular mechanism in which double-stranded RNA triggers sequence-specific silencing of mRNA, either by degradation or translational inhibition.