AQA A-Level Biology Paper 1, June 2024
Every question from AQA A-Level Biology Paper 1, June 2024 (7402): 10 questions, 91 marks, each with its mark scheme and topic.
- Question 1 8 marks
Identify the bond and reaction involved in triglyceride formation, name a saturated fatty acid and describe its relationship with melting point using Table 1, and explain the effect of unsaturated fatty acids on membrane fluidity and phagocytosis.
Biology · 3.1 Biological molecules · 3.2 Cells
- Question 2 7 marks
Describe facilitated diffusion and active transport, define microvilli, and describe the process of vitamin A absorption into cells lining the ileum.
Biology · 3.2 Cells · 3.3 Organisms exchange substances with their environment
- Question 3 10 marks
Describe the mechanism of breathing in, explain the need for thin tissue slices when using an optical microscope, identify a labeled tube from lung tissue, calculate mean alveolar diameter in micrometres given image magnification and measurements, and calculate percentage error from ruler measurements.
Biology · Practical skills · 3.3 Organisms exchange substances with their environment · 3.2 Cells · Uncertainty and evaluation · Data analysis
- Question 4 10 marks
Analyze monosaccharides in molasses, perform a reducing sugar test, calculate free sugar energy allowances, explain osmosis using a diagram, and determine changes in water potential based on air pressure differences.
Biology · Practical skills · 3.1 Biological molecules · 3.2 Cells · Data analysis
- Question 5 10 marks
Describe the appearance and behaviour of chromosomes during mitosis stages, calculate mitotic index, interpret a correlation coefficient, and analyze cell cycle distribution from root tip data.
Biology · Practical skills · Required Practicals · 3.2 Cells · Data analysis · AS practicals (1–6)
- Question 6 8 marks
Compare the structure of mRNA and tRNA, use the genetic code table to determine amino acids from mRNA codons, and analyze the effect of a base substitution mutation on enzyme structure and function.
Biology · 3.4 Genetic information, variation and relationships between organisms · 3.8 The control of gene expression (A-level only) · 3.5 Energy transfers in and between organisms (A-level only)
- Question 7 9 marks
Design a results table, explain differences in enzyme activity between apple varieties, suggest a method modification to increase reaction rate, and select the correct procedure to measure enzyme activity.
Biology · Practical skills · Required Practicals · Data analysis · 3.1 Biological molecules · AS practicals (1–6)
- Question 8 8 marks
Relate the structural features of the aorta to its function, analyze data on aorta diameter and aneurysm risk, and calculate the percentage change in stroke volume between a diseased and healthy heart.
Biology · 3.3 Organisms exchange substances with their environment
- Question 9 6 marks
Calculate the number of males making mating calls in the control population and suggest and explain the effect of EE2 pollution in frog habitats on frog breeding using data from Table 6 and Table 7.
Biology · Practical skills · Data analysis · 3.7 Genetics, populations, evolution and ecosystems (A-level only)
- Question 10 15 marks
Describe and explain cell fractionation and ultracentrifugation for obtaining nuclei, the role of organelles in enzyme production, and the structure and metabolism of ATP.
Biology · 3.1 Biological molecules · 3.2 Cells