Biology Aqa As Level7401/1 Paper 1 24 Correctly Answered Questions Latest Update

This fat substitute cannot be digested in the gut by lipase. Suggest why. {Ans: - (Fat substitute) is a different/wrong shape/not complementary - Unable to fit/bind to (active site of) lipase/no ES complex formed;}When some of these types of drugs were trialled on patients, the trials were stopped because some patients developed serious side effects (lines 11-13). Using the information provided, suggest why some patients developed serious side effects. {Ans: - Some β-amyloid required/needed (to prevent side effects) - Leads to build-up of amyloid-precursor protein (that causes harm) OR Too much product of α-secretase (causes harm)}Many people with Alzheimer's disease have mutations that decrease α-secretase production or increase β-secretase production (lines 8-9). Use the information provided to explain how these mutations can lead to Alzheimer's disease. {Ans: - Mutations prevent production of enzyme - (Increase in β-secretase) leads to more β-amyloid production - (Leads to) more/greater plaque formation}name the part of the mitochondrion labelled X in Figure 2 {Ans: Crista/cristae}In the cell wall, bonds hold the cellulose molecules together side by side. Name that bond {Ans: Hydrogen}Chromosomes line up on the equator of the mitotic spindle in the... {Ans: Metaphase}One possible type of drug