Biotechnology & Its Applications: NEET Exam Strategy

Highest-yield fact: cry gene-crop association. Memorize: cotton = cry1Ac + cry2Ab; corn = cry1Ab. This is tested almost every year. Never guess — always recall the specific gene names.
Second-highest yield: Bt toxin mechanism — protoxin inactive in bacterium, activated by alkaline gut pH. NEET MCQs use "acidic" and "active inside bacterium" as common wrong options.
Gene therapy sequence: ADA deficiency → lymphocytes isolated → retroviral vector → reinfused → not permanent → bone marrow transplant for permanent cure. Know each step in order.
Diagnostic disambiguation: If the question asks about detecting DNA → PCR. If detecting protein $\frac{antigen}{antibody}$ → ELISA. If radioactive probe on membrane → autoradiography.
Chain length anchors: A = 21, B = 30. These numbers appear in statements like "human proinsulin has ___ amino acids in the A chain." Don't confuse with other proteins.
RNAi specifics: The nematode is Meloidogyne incognita; the plant is tobacco. Both details appear in MCQs. The mechanism requires dsRNA formation (not single-stranded RNA).
Biopiracy: pattern in NEET — questions give a description and ask which resource was involved. Neem = antifungal; turmeric = wound healing; basmati = grain traits (RiceTec).
GEAC vs. other bodies: GEAC is for GMO field trials and commercial release in India. It is NOT the body for gene therapy approval or biopiracy regulation.
Transgenic animal names: Rosie = cow = alpha-lactalbumin. Sheep = alpha-1-antitrypsin. Do not swap these.
Time strategy: This chapter accounts for 2–3 marks and is largely factual. Spend 1 minute per question; if a cry gene question appears, answer immediately and move on — do not second-guess.