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100+ Free Advanced Higher Biology Practice Questions

Pass your Scottish Advanced Higher Biology (C807 77) exam on the first try — instant access, no signup required.

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Key Facts: Advanced Higher Biology Exam

A-D

Pass grades on Advanced Higher

Qualifications Scotland

100 marks

Question paper total

AH Biology course specification C807 77

2h 30min

Question paper duration

Qualifications Scotland

100

Free practice questions here

OpenExamPrep

Qualifications Scotland Advanced Higher Biology is a one-year course assessed through a 2h 30min, 100-mark written question paper plus a 30-mark project. Content spans laboratory techniques, protein chemistry, enzyme kinetics, evolution, animal behaviour and statistical analysis, with grades A to D counting as a pass on the 2026 specification.

Sample Advanced Higher Biology Practice Questions

Try these sample questions to test your Advanced Higher Biology exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which chromatography technique separates molecules using a stationary phase coated onto a thin silica plate with the mobile phase rising by capillary action?
A.Thin-layer chromatography (TLC)
B.Paper chromatography
C.Column chromatography
D.Gas-liquid chromatography
Explanation: Thin-layer chromatography uses a thin layer of silica gel (or alumina) on a glass or plastic backing as the stationary phase, with a solvent rising by capillary action as the mobile phase. TLC gives sharper separations and is generally faster than paper chromatography.
2In SDS-PAGE, what is the primary role of sodium dodecyl sulfate (SDS)?
A.It denatures proteins and coats them in negative charge proportional to mass
B.It cross-links proteins to fix their native fold
C.It removes disulfide bonds without affecting charge
D.It catalyses protein cleavage at lysine residues
Explanation: SDS is an anionic detergent that unfolds (denatures) proteins and binds along the polypeptide, coating it in a uniform negative charge roughly proportional to its mass. Migration through the gel therefore depends almost exclusively on molecular mass, not native charge or shape.
3Agarose gel electrophoresis of DNA fragments separates them primarily by which property?
A.Fragment size, with smaller fragments migrating further
B.Net charge, with positive fragments migrating further
C.Base composition, with AT-rich fragments migrating slower
D.Methylation status of cytosines
Explanation: All DNA carries a uniform negative charge per nucleotide from the phosphate backbone, so fragments migrate towards the anode at rates governed by size: smaller fragments thread through the agarose mesh more rapidly. A DNA ladder of known sizes is run alongside for size estimation.
4In an indirect ELISA, what is detected by the enzyme-linked secondary antibody?
A.The primary antibody bound to the antigen
B.The antigen directly
C.The well surface coating
D.The substrate before enzymatic conversion
Explanation: In an indirect ELISA the antigen is immobilised in the well, an unlabelled primary antibody binds the antigen, and an enzyme-linked secondary antibody then binds the primary. Adding substrate produces a coloured product whose intensity reports on antigen quantity.
5Western blotting (immunoblotting) is used to detect:
A.Specific proteins separated by gel electrophoresis
B.Specific DNA sequences separated by gel electrophoresis
C.Specific RNA sequences separated by gel electrophoresis
D.Carbohydrate residues attached to membrane lipids
Explanation: Western blotting follows SDS-PAGE: proteins are transferred from the gel to a membrane (nitrocellulose or PVDF) and identified by a specific primary antibody followed by an enzyme- or fluorescence-labelled secondary antibody. Southern blots detect DNA and Northern blots detect RNA.
6Which microscopy technique gives a 3D-like surface image of a specimen coated with a thin layer of gold?
A.Scanning electron microscopy (SEM)
B.Transmission electron microscopy (TEM)
C.Phase-contrast light microscopy
D.Confocal fluorescence microscopy
Explanation: Scanning electron microscopy raster-scans a focused beam across a gold-coated specimen and detects secondary electrons emitted from the surface, producing a 3D-appearing topographical image. TEM, by contrast, transmits electrons through ultrathin sections to reveal internal structure.
7Fluorescence in situ hybridisation (FISH) uses what to locate specific DNA sequences in cells?
A.A fluorescently labelled complementary nucleic acid probe
B.A primary antibody against a histone protein
C.A radioactive thymidine pulse
D.A small-molecule DNA-staining dye like DAPI alone
Explanation: FISH applies a single-stranded nucleic acid probe carrying a fluorescent label that hybridises to its complementary target sequence in fixed cells or chromosomes. Visualised under a fluorescence microscope, this reveals the chromosomal location of specific genes.
8Flow cytometry sorts and counts cells based on which properties as they pass single-file through a laser beam?
A.Size, granularity and fluorescence
B.DNA sequence and methylation
C.ATP content and pH only
D.Membrane phospholipid composition
Explanation: In flow cytometry cells in suspension pass single-file through a laser; forward scatter reports cell size, side scatter reports internal granularity, and fluorescence detectors quantify fluorescent stains or labelled antibodies. Cells can then be sorted (FACS) on these readouts.
9Aseptic technique in cell culture is required primarily to:
A.Prevent contamination by microorganisms
B.Maintain temperature at 37 degrees Celsius
C.Provide gas exchange of carbon dioxide
D.Supply serum proteins to the cells
Explanation: Aseptic technique uses sterile equipment, laminar-flow cabinets, and disinfectants to keep bacterial, fungal and viral contaminants out of cell cultures. Temperature, gas exchange and serum supply are addressed by the incubator and the growth medium respectively.
10Which amino acid R-group property determines whether a residue is most likely to be found buried inside a globular protein in aqueous solution?
A.Nonpolar (hydrophobic) side chain
B.Acidic carboxylate side chain
C.Basic amino side chain
D.Polar hydroxyl side chain
Explanation: Hydrophobic side chains (e.g. leucine, valine, phenylalanine) cluster in the protein interior to minimise unfavourable contact with water, driving folding through the hydrophobic effect. Polar, acidic and basic residues are usually exposed on the surface to interact with the aqueous environment.

About the Advanced Higher Biology Exam

Advanced Higher Biology (course code C807 77) is offered by Qualifications Scotland as the most advanced Scottish school biology qualification. The course spans three units — Cells and Proteins, Organisms and Evolution, and Investigative Biology — assessed by a 100-mark written question paper (2 hours 30 minutes) and a separately marked 30-mark project.

Questions

100 scored questions

Time Limit

2 hours 30 minutes for the question paper plus project assignment time

Passing Score

Grade A is the highest, A-D count as a pass (A-B-C-D), No Award is a fail

Exam Fee

Funded by Scottish Government for school candidates; private candidate entry fee approx GBP 49.10 per subject (Qualifications Scotland (formerly SQA))

Advanced Higher Biology Exam Content Outline

Unit 1

Cells and Proteins: Laboratory Techniques

Chromatography (paper, TLC, column), electrophoresis (SDS-PAGE, agarose), immunoassays (ELISA), immunoblotting, light and electron microscopy (TEM, SEM), fluorescence microscopy, flow cytometry and aseptic cell culture

Unit 1

Protein Structure and Function

Amino acid R-groups, peptide bonds, primary, secondary (alpha helix, beta sheet), tertiary and quaternary structure, globular versus fibrous proteins, haemoglobin and the Bohr effect, collagen triple helix

Unit 1

Membrane Proteins and Cellular Communication

Channel and carrier proteins, ion pumps, receptor types, G-protein coupled receptors, secondary messengers (cAMP, IP3) and tyrosine kinase signal transduction

Unit 1

Enzymes and Metabolism

Michaelis-Menten and Lineweaver-Burk kinetics, Vmax and Km, cooperativity, allosteric regulation, induced fit, competitive versus non-competitive inhibition, coenzymes (NAD, FAD, CoA)

Unit 1

Cell Cycle and Apoptosis

G1, S, G2 and M phase checkpoints, cyclins and cyclin-dependent kinases, p53 and oncogenes, intrinsic and extrinsic apoptosis pathways and the caspase cascade

Unit 2

Organisms and Evolution: Field Techniques

Point and transect sampling, quadrats, mark-release-recapture and the Lincoln Index, identification keys, monitoring of populations and habitats

Unit 2

Evolution and Sexual Selection

Darwin and Wallace, natural selection mechanisms, co-evolution, sexual selection, Fisherian runaway, the handicap principle and reproductive strategies

Unit 2

Speciation and Phylogenetics

Allopatric and sympatric speciation, prezygotic and postzygotic barriers, hybrid zones, punctuated equilibrium, cladograms, molecular clocks and neutral theory

Unit 2

Animal Behaviour

Innate versus learned behaviour, habituation and sensitisation, classical and operant conditioning, imprinting, fixed action patterns, optimal foraging, kin selection and eusociality

Unit 2

Reproduction and Parasitism

Gametogenesis, fertilisation, embryonic development and germ layers, metamorphosis, parental care, parasitic life cycles and symbiosis

Unit 3

Investigative Biology: Scientific Method and Design

Hypotheses, null hypothesis and Popperian falsifiability, independent, dependent and control variables, randomised and paired designs, blinding, placebos, replication and pilot studies

Unit 3

Statistical Analysis and Reporting

Descriptive statistics (mean, SD, SEM, CI), Pearson and Spearman correlation, t-tests, ANOVA, chi-squared, degrees of freedom, Type I and Type II errors, scientific reports and peer review

How to Pass the Advanced Higher Biology Exam

What You Need to Know

  • Passing score: Grade A is the highest, A-D count as a pass (A-B-C-D), No Award is a fail
  • Exam length: 100 questions
  • Time limit: 2 hours 30 minutes for the question paper plus project assignment time
  • Exam fee: Funded by Scottish Government for school candidates; private candidate entry fee approx GBP 49.10 per subject

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

Advanced Higher Biology Study Tips from Top Performers

1Work through past papers from Qualifications Scotland and SQA in the May exam style — extended response patterns and topic emphasis repeat year on year
2Memorise the laboratory techniques carefully — the question paper rewards precise method recall (SDS-PAGE, ELISA, chromatography)
3Practice chi-squared and t-test calculations until you can recall formulae, degrees of freedom and critical-value tables under exam pressure
4Use the official marking instructions to learn how Knowledge (K), Application (A) and Skills (S) marks are awarded across the question paper

Frequently Asked Questions

Who awards Advanced Higher Biology?

Advanced Higher Biology is awarded by Qualifications Scotland, the awarding body formed from the Scottish Qualifications Authority (SQA) on 1 February 2026. The course specification and grading framework are unchanged from the previous SQA syllabus.

When is the Advanced Higher Biology exam sat?

The question paper is sat in the May exam diet at the end of S6 (or post-school). The 30-mark project is internally completed across the year and externally marked by Qualifications Scotland alongside the written paper.

How is Advanced Higher Biology graded?

Advanced Higher courses are graded A, B, C, D, or No Award. Grades A through D count as a pass; the 30-mark project assignment contributes alongside the 100-mark question paper to determine the final overall grade.

How does Advanced Higher Biology compare to A-Level Biology?

Advanced Higher Biology is widely regarded as broadly comparable to A-Level Biology in standard, with particular emphasis on practical and investigative skills through the project. It introduces undergraduate-level techniques such as Lineweaver-Burk plots, chi-squared analysis and signal transduction not always required at A-Level.