AQA AS Level Biology Paper 1, November 2020
Every question from AQA AS Level Biology Paper 1, November 2020 (7401): 9 questions, 75 marks, each with its mark scheme and topic.
- Question 1 8 marks
Identify biological molecules from given structural diagrams, calculate the molecular formula of a trisaccharide, and describe the biochemical test for non-reducing sugars.
Biology · 3.1 Biological molecules
- Question 2 6 marks
Explain the arrangement of phospholipids in a cell-surface membrane, describe how an ester bond is formed in a phospholipid molecule, and state and explain the property of water that helps to prevent temperature increase in a cell.
Biology · 3.1 Biological molecules
- Question 3 7 marks
Describe phagocytosis, identify cells that stimulate an immune response, label an antibody diagram where the antigen-binding site forms, and state the role of disulfide bridges in quaternary antibody structure.
Biology · 3.2 Cells
- Question 4 9 marks
Outline the role of organelles in protein production and transport, suggest why a nucleus is not visible in a TEM micrograph, identify organelles S and T, give an advantage of TEM over SEM, and calculate the number of cells in a leaf surface in standard form.
Biology · Practical skills · 3.2 Cells · Data analysis
- Question 5 9 marks
Describe and explain lung ventilation, identify tissue structures, explain staining choice, and evaluate statistical conclusions regarding asthma risk factors.
Biology · 3.3 Organisms exchange substances with their environment
- Question 6 7 marks
Describe transcription of mRNA, define an exon, translate a DNA sequence into amino acids using a provided codon table, and evaluate a mutation type.
Biology · 3.4 Genetic information, variation and relationships between organisms
- Question 7 10 marks
Describe binary fission in bacteria, interpret a growth rate graph for Bacillus subtilis, convert units of mass, and suggest environmental variables to increase cell growth rate.
Biology · 3.2 Cells
- Question 8 9 marks
Draw a histogram to represent birth mass frequency density data, calculate the number of babies with low birth mass using a provided table and equation, and state three conclusions from a line graph showing infant survival against birth mass for smokers and non-smokers.
Practical skills · Biology · Data analysis · 3.4 Genetic information, variation and relationships between organisms
- Question 9 10 marks
Explain the effects of genetic modification on aquaporin expression, membrane permeability, stomatal density, and calculate ion-to-water movement ratios.
Biology · 3.2 Cells · 3.4 Genetic information, variation and relationships between organisms