AQA A Level Paper 2 Biology Exam (2024) || Complete Questions & Answers (100% Accurate)

AQA A Level Paper 2 Biology Exam (2024) || Complete Questions & Answers (100% Accurate) AQA A Level Paper 2 Biology Exam (2024) || Complete Questions & Answers (100% Accurate) heat stress decreases the light-dependent reaction of photosynthesis. explain why this leads to a decrease in the light-independent reaction [2] - ANSWER - - less ATP - Less NADH A decrease in the activity of the enzyme rubisco would limit the rate of photosynthesis. Explain why [2] - ANSWER - - Less CO2 reacts with RuBp - Less GP is produced where precisely is rubisco found in a cell [1] - ANSWER - Stroma in chloroplasts the scientists concluded that heat stress reduces the activity of rubisco in plant leaves by affecting rubisco activase evaluate conclusion [4] - ANSWER - - rubisco activity increases with temp - rubisco activase activity decreases after optimum at 30 degrees - graph suggests that rubisco activase does not affect activity of rubisco = (increases always) - results only for cotton plants not other plants = not generalisable what incorrectly describes the effect of the mutation in an exon of gene [1] a ) a subsitution may not results in a change to the encoded amino acid b ) an inversion will result in a change in a number of DNA bases c ) a deletion will result in a frameshift d ) an addition will result in a frame shift - ANSWER - b describe how alterations to tumour suppessor genes can lead to development of tumours [3] - ANSWER - - increase in methylation = mutation occurs - amino acid sequence change = tertiary structure altered - uncontrolled cell division suggest 1 reason why it was important that the student left the apparatus for 1 hour after the yeast culture reached a constant temp