Mastering Resting Potential, Action Potential and Propagation: Common OCR A Level Biology Questions Answered

OCR A Level Biology: Mastering Biodiversity and Simpson's Index (Section 4.2.1 a-d)

Prior Knowledge to Recap

Before diving into biodiversity questions, ensure you understand these foundational concepts:

• The three levels of biodiversity: genetic diversity (variation within species), species diversity (number and abundance of species), and habitat/ecosystem diversity (range of different habitats)

• Species richness vs species evenness: richness is the total number of different species present, whilst evenness refers to how similar the abundance of each species is

Mastering Neuronal Communication: Common OCR A Level Biology Questions Answered

Prior Knowledge to Recap

Before diving into neuronal communication, make sure you're confident with these key concepts:

Mastering Microscopy and Cell Structure: Common OCR A Level Biology Questions Answered

Prior Knowledge to Recap

Before diving into microscopy and cell structure, make sure you're confident with these key concepts:

• Basic cell structure – understanding the difference between prokaryotic and eukaryotic cells, and being able to identify major organelles like the nucleus, mitochondria, and chloroplasts

• Units of measurement – being confident with converting between millimetres (mm), micrometres (μm), and nanometres (nm) is essential for magnification calculations (1mm = 1000μm, 1μm = 1000nm)

OCR A Level Biology: Mastering Photosynthesis - The Calvin Cycle and Limiting Factors (Section 5.2.1 e, f, g)

Prior Knowledge to Recap

Before diving into these photosynthesis questions, ensure you understand these foundational concepts:

• The two stages of photosynthesis: the light-dependent stage (in thylakoid membranes) produces ATP and reduced NADP, whilst the light-independent stage (Calvin cycle in the stroma) uses these products to fix CO₂

• The Calvin cycle pathway: CO₂ combines with RuBP (catalysed by RuBisCO) to form GP, which is reduced to TP using ATP and reduced NADP, with most TP recycled to regenerate RuBP