ABt toxin- Biofertiliser
BProinsulin-A peptide chain and B peptide chain
CTi plasmid -Trichinella spiralis
DRNA interference - Silencing of mRNA
Answer:
D. RNA interference - Silencing of mRNA
Read Explanation:
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.
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.
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.
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.