AQA AS Level Biology Paper 1, June 2023
Every question from AQA AS Level Biology Paper 1, June 2023 (7401): 9 questions, 75 marks, each with its mark scheme and topic.
- Question 1 5 marks
Describe the primary structure of all proteins and define the terms universal, non-overlapping, and degenerate in the context of the genetic code.
Biology · 3.1 Biological molecules · 3.4 Genetic information, variation and relationships between organisms
- Question 2 8 marks
Compare prokaryotic and eukaryotic cell structures regarding DNA and membranes, describe the mechanism of breathing, and explain how bacterial capsule thickness affects survival against phagocytes.
Biology · 3.2 Cells · 3.3 Organisms exchange substances with their environment · 3.4 Genetic information, variation and relationships between organisms
- Question 3 9 marks
Compare the structure of triglycerides and phospholipids, explain bilayer formation, and interpret data on fatty acid composition and membrane fluidity.
Biology · Practical skills · 3.1 Biological molecules · 3.2 Cells · Data analysis
- Question 4 8 marks
Calculate the volume of a naïve T cell from an electron micrograph, determine the scale factor compared to an activated helper T cell, distinguish electron microscopy features, state the role of a helper T cell, and describe the role of tRNA in translation.
Biology · 3.2 Cells · 3.4 Genetic information, variation and relationships between organisms
- Question 5 9 marks
Calculate surface area to volume ratios, determine means from experimental diffusion data involving agar blocks, identify controlled variables, and explain gas exchange in single-celled versus large organisms.
Biology · Practical skills · 3.3 Organisms exchange substances with their environment · Experimental design · Data analysis
- Question 6 9 marks
Evaluate whether 10- to 12-year-old boys should be given the HPV vaccine, following questions on human papillomavirus structure, DNA replication enzymes, and cancer development.
Biology · 3.1 Biological molecules · 3.2 Cells · 3.4 Genetic information, variation and relationships between organisms
- Question 7 8 marks
Analyze prokaryotic biodiversity and agricultural impact using data from two farming methods, including definitions of biodiversity indices and evaluation of conservation versus farming balance.
Biology · 3.4 Genetic information, variation and relationships between organisms
- Question 8 9 marks
Analyze root-tip mitosis practical techniques, statistical testing of mitotic index data, and cell count calculations.
Biology · Practical skills · Required Practicals · 3.2 Cells · Experimental design · Data analysis · Uncertainty and evaluation · AS practicals (1–6)
- Question 9 10 marks
Analyze carbohydrate transport mechanisms in plants and mammals including mass flow, water potential changes, muscle glucose uptake during exercise, and transport protein structure.
Biology · 3.1 Biological molecules · 3.2 Cells · 3.3 Organisms exchange substances with their environment