Cambridge Cambridge International A-Level Science

Cambridge Cambridge International A-Level Science Learning Path

Detailed syllabus unit mapping, custom lesson objectives, required laboratory practical guides, and assessment MCQ checklists.

Advanced A2 syllabus. Covers gravitational fields, PCR gene technologies, electrochemistry thermodynamics, and biochemistry.

Lesson Plans & Objectives

Polymerase Chain Reaction (PCR)60 min

Explain denaturation, annealing, and extension temperature cycles.
Describe the role of Taq polymerase enzyme.

Electrophoresis and Plasmids60 min

Outline gel separation of DNA fragments based on charge.
Explain plasmid vectors in transformation.

Suggested Practical Activities

Extracting genomic DNA from strawberries and running mock agarose gel dye separations

Revision Notes

PCR steps: Denaturation (95°C), Annealing (55-60°C), Extension (72°C).
DNA is negatively charged (due to phosphate groups) and migrates towards the positive anode in an electric field.

CAIE Worked Examples & Mark Scheme Breakdown

Example 1: PCR Amplification Exponential FactorCAIE Step-by-Step

Starting with 1 single double-stranded DNA molecule, calculate the total number of DNA molecules generated after 25 complete cycles of PCR.

Step 1: State amplification formulaN = N0 × 2^n where n = 25 cycles

Step 2: Calculate exponent2^25 = 33,554,432 molecules

Final CAIE Answer:33,554,432 DNA molecules

Example 2: Nernst Equation Standard Cell PotentialCAIE Step-by-Step

Calculate the standard cell potential E°cell for a galvanizing cell: Zn(s) | Zn²⁺(aq) || Cu²⁺(aq) | Cu(s) given E°(Zn²⁺/Zn) = -0.76 V and E°(Cu²⁺/Cu) = +0.34 V.

Step 1: State cell potential formulaE°cell = E°reduction(cathode) - E°reduction(anode)

Step 2: Substitute potential valuesE°cell = (+0.34 V) - (-0.76 V) = +0.34 + 0.76

Step 3: Compute E°cellE°cell = +1.10 V

Final CAIE Answer:+1.10 V

Example 4: Radioactive Half-Life & Decay ConstantCAIE Step-by-Step

A sample of Iodine-131 has a half-life t_1/2 of 8.0 days. Calculate its decay constant λ in day⁻¹.

Step 1: State half-life decay formulaλ = ln(2) / t_1/2 = 0.693 / 8.0

Step 2: Calculate λλ = 0.0866 day⁻¹

Final CAIE Answer:0.0866 day⁻¹

Example 5: Michaelis-Menten Enzyme Kinetics Vmax & KmCAIE Step-by-Step

An enzyme catalyzed reaction has a Vmax of 100 μmol/min. Calculate reaction rate v when substrate concentration [S] is equal to Km.

Step 1: State Michaelis-Menten equationv = (Vmax · [S]) / (Km + [S])

Step 2: Substitute [S] = Kmv = (Vmax · Km) / (2Km) = 0.5 · Vmax

Step 3: Calculate rate vv = 0.5 × 100 = 50 μmol/min

Final CAIE Answer:50 μmol/min

Loading NexProTools...

Preparing interactive calculation engine

Cambridge Cambridge International A-Level Science Learning Path

A-Level Biology: Genetic Technology

Lesson Plans & Objectives

Suggested Practical Activities

Revision Notes

CAIE Worked Examples & Mark Scheme Breakdown

Cambridge Cambridge International A-Level Science Learning Path

A-Level Biology: Genetic Technology

Lesson Plans & Objectives

Suggested Practical Activities

Revision Notes

CAIE Worked Examples & Mark Scheme Breakdown