A-level Biology AQA paper 1 2019 Correct 100%

Describe how a non-competitive inhibitor can reduce the rate of an enzyme controlled reaction - ANSWERBinds away from active site Changes shape of active site So no longer complementary so less substrate can bind How to identify a competitive inhibitor - ANSWERWith the inhibitor, it increases substrate conc + doesent change rate of reaction No large lipid droplets are visible with the optical microscope in the samples from suspension A. Explain why - ANSWEREmulsification Cant be seen due to resolution. A student concluded that eating an extra 10g of fibre a day would significantly lower his risk of cardiovascular disease. Evaluate his conclusion - ANSWERNegative correlation Correlation does not mean causation Little evidence for higher mass of fibre per day Large S.D at high mass of fibre makes mean less precise FFQ method +ve -ve - ANSWERDiet over 24 hrs can easily remember Relies on long term memory What data would each student need to collect to calculate their index of diversity in each habitat - ANSWERNumber of individuals in each species Concluding results - ANSWERProbability that the difference is due to chance is