Topic: Frequent Errors and How to Avoid Them
Error 1: Confusing Bt toxin activation pH
- Wrong: "Bt toxin is activated by acidic pH in the insect gut"
- Correct: Bt toxin is activated by ALKALINE pH (~10) in the lepidopteran midgut
- Why students err: "Stomach = acidic" is the default association; students apply it to insects
- Memory fix: Caterpillars are not humans. Lepidopteran midgut is ALKALINE — opposite of human stomach.
Error 2: Mixing cry gene-crop associations
- Wrong: "cry1Ab is present in Bt cotton"
- Correct: cry1Ab is in Bt CORN; Bt cotton carries cry1Ac + cry2Ab
- Memory fix: "Cotton is Complex — needs two (cry1Ac + cry2Ab); Corn is Clean — just one (cry1Ab)." The "b" in cry1Ab stands for borer (corn borer).
Error 3: Confusing Rosie's product
- Wrong: "Rosie produced alpha-1-antitrypsin"
- Correct: Rosie produced human alpha-LACTALBUMIN; transgenic SHEEP produce alpha-1-antitrypsin
- Memory fix: "Rosie the cow → LACtation-related protein (LACtalbumin). Sheep → lung protein (antitrypsin for emphysema)."
Error 4: Stating gene therapy is permanent
- Wrong: "Gene therapy permanently cures ADA deficiency"
- Correct: Gene therapy using lymphocytes is NOT permanent — lymphocytes die. Only bone marrow transplant is permanent.
- Why students err: "Gene therapy = inserting a gene = permanent" seems logical but ignores cell lifespan
Error 5: Calling PEG-ADA "gene therapy"
- Wrong: "PEG-ADA injection is an example of gene therapy"
- Correct: PEG-ADA is ENZYME REPLACEMENT THERAPY — a protein, not a gene, is delivered
- Memory fix: Gene therapy = a GENE is delivered. Enzyme therapy = a PROTEIN is delivered.
Error 6: Incomplete biopiracy list
- Wrong: Only mentioning neem and turmeric
- Correct: Three cases: Neem + Turmeric + Basmati rice
- Memory fix: "NTB" — Neem, Turmeric, Basmati = India's National Treasure Bio-resources
Error 7: Stating GEAC's full form incorrectly
- Wrong: "Genetic Engineering Advisory Committee" or "Approval Committee for Genetic Engineering"
- Correct: Genetic Engineering APPROVAL Committee
- Memory fix: It APPROVES (or rejects) GMOs — the word "Approval" is central to its function.