B6: Gene Technologies and Biotechnology
Official Cambridge & Imperial ESAT specification requirements for Gene Technologies and Biotechnology on the Biology paper. Understand the syllabus boundaries, spot distractor traps engineered by examiners, and master the 2-step Sub-90 shortcuts that compress solve time well below the 88.8-second cutoff.
Official Syllabus Subtopics
Requirements specified in the UAT-UK framework
- 1Restriction endonucleases cutting specific palindromic recognition sequences, producing sticky or blunt ends
- 2DNA ligase annealing complementary sticky ends by forming covalent phosphodiester bonds
- 3Plasmids as vectors for recombinant DNA technology
- 4Marker genes for recombinant screening: antibiotic resistance and fluorescent GFP markers
- 5Polymerase Chain Reaction (PCR) temperature cycles: 95°C denaturation, 55°C primer annealing, 72°C Taq polymerase elongation
- 6Agarose gel electrophoresis: separation of negatively charged DNA fragments by length
Sub-90 Exam Speed Tips
How top candidates solve this spec under the 88.8s clock
DNA fragments carry a constant negative charge along their sugar-phosphate backbone and migrate toward the positive anode; smaller fragments move faster and further.
Taq polymerase is extracted from thermophilic bacteria so it does not denature at the 95°C PCR melting stage.
Examiners engineer distractor options using common algebraic expansions and sign slips. Always test structural ratios or invariants before calculating arithmetic values.
Tested Topics in Specification B6
Master the individual question patterns and Sub-90 shortcuts for this specification.
Recombinant DNA: Restriction Endonucleases, Sticky Ends, Ligase & Plasmid Marker Screening
Memorise the 3 recombinant rules: (1) Same restriction enzyme cuts both donor & plasmid -> complementary sticky ends (H-bonds form spontaneously). (2) DNA ligase seals the sugar-phosphate phosphodiester backbone. (3) n cuts in a circular plasmid = n fragments.
Ready to Master Specification B6 Under Exam Conditions?
Practice timed questions under the authentic Pearson VUE interface with live split stopwatch pacing, dry-wipe scratchpad, and distractor forensics.