Biology > AQA QUESTION and MARK SCHEMES > Specimen MS - Paper 1 AQA Biology A-Level (All)
Specimen MS - Paper 1 AQA Biology A-Level
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Specimen MS - Paper 1 AQA Biology A-Level A-level BIOLOGY (7402/1) Paper 1 Mark scheme Any two of the following; Concentration of enzyme Volume of substrate solution pH Ratio between 5... .18:1 and 5.2:1; Initial rates incorrect but correctly used At 60 °C: 1. More kinetic energy; 2. More E–S complexes formed; Different times: 1. Higher temperature / 60 °C causes denaturation of all of enzyme; 2. Reaction stops (sooner) because shape of active site changed; Different concentrations of product (at 60 °C) 3. Substrate still available (when enzyme denatured); 4. But not converted to product; . Trachea and bronchi and bronchioles; 2. Down pressure gradient; 3. Down diffusion gradient; 4. Across alveolar epithelium; 5. Across capillary endothelium/epithelium; [Show More]
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