Lesson 3.3.2

3.3.2 Collection and processing of forensic evidence (biological) Quiz: OCR Psychology, Unit 3

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.3.2, Collection and processing of forensic evidence (biological): 20 multiple choice questions for the OCR Psychology (H567), Unit 3: Applied psychology (Component 03), written with Revision Ninja.

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The 20 questions

  1. Which component of blood is primarily used for DNA profiling in forensic investigations?

    • White blood cells
    • Platelets
    • Red blood cells
    • Blood plasma

  2. What does the acronym DNA stand for in forensic biological evidence collection?

    • Deoxyribose nitrogen
    • Dopamine nucleic acid
    • Deoxyribonucleic acid
    • Dichloronucleic acid

  3. Which chemical is commonly sprayed at crime scenes to detect latent blood traces?

    • Luminol
    • Cyanacrylate
    • Ninhydrin
    • Silver nitrate

  4. What technique is used to amplify trace amounts of DNA found at a crime scene?

    • PCR
    • GC-MS
    • RFLP
    • STR

  5. What specific genetic markers are standardly analysed in UK criminal forensic databases?

    • MRSA
    • SNPs
    • RNA
    • STRs

  6. Which packaging material should investigators use for wet blood samples to prevent mould?

    • Glass jars
    • Aluminium foil
    • Plastic bags
    • Paper bags

  7. What database holds DNA profiles of individuals arrested or convicted in the UK?

    • NDNAD
    • AFIS
    • NCIC
    • CODIS

  8. A forensic investigator swabs a suspected saliva stain from a mug. What type of evidence is this?

    • Trace biological
    • Chemical residue
    • Trace digital
    • Physical impression

  9. Blood spatter drops falling from a height of two metres hit a hard floor. What shape are they typically?

    • Circular
    • Elongated
    • Linear streaks
    • Dumbbell-shaped

  10. Police find bloodstains forming a directional trail leading away from a burglary. What should they record first?

    • Cell count
    • Spatter angle
    • Blood volume
    • Plasma ratio

  11. A suspect claims blood on their jacket is from a nosebleed last week. How can investigators test this?

    • UV lighting
    • Enzyme tagging
    • Luminol spray
    • Cellular ageing

  12. Crime scene technicians collect hair samples. Which part of the hair shaft yields nuclear DNA?

    • Medulla core
    • Cortex strand
    • Root follicle
    • Cuticle layer

  13. Officers package a knife with suspected blood on it. What primary risk does improper sealing pose?

    • Degradation
    • Alteration
    • Evaporation
    • Magnification

  14. An analyst compares 16 specific loci on an evidence sample. What database matching system is being used?

    • Fingerprint dusting
    • Toxicology screen
    • DNA profiling
    • Ballistics testing

  15. Why might a mixed DNA sample from a fight scene complicate a forensic prosecution?

    • Atomic decay
    • Total destruction
    • Chemical burnout
    • Profile masking

  16. What critical protocol must crime scene investigators follow to maintain evidence integrity?

    • Chain of custody
    • Double blind
    • Random sampling
    • Peer review

  17. How does extreme heat at a fire scene primarily affect biological evidence like skin cells?

    • Thermal destruction
    • Rapid replication
    • Cellular freezing
    • Enzyme activation

  18. Why are single-use disposable gloves worn when collecting biological samples?

    • Block radiation
    • Enhance grip
    • Prevent contamination
    • Improve visibility

  19. Which specific bodily fluid is most frequently targeted for STR analysis in sexual assault cases?

    • Semen
    • Sweat
    • Urine
    • Saliva

  20. A technician recovers a bone fragment from a burnt car. Which hard tissue component yields resilient DNA?

    • Periosteum
    • Compact bone
    • Cartilage
    • Bone marrow

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