Ch 8: Blood And Blood Spatter Exam 4ac

21 Questions | Total Attempts: 89

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Ch 8: Blood And Blood Spatter Exam 4ac

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Questions and Answers
  • 1. 
    Mr. Fred Dead was reported to be missing by his wife.  She knew that he owed money to a Mr. Ding Dong and she was concerned. Police arrived at the home of Mr. Dong and discovered high velocity blood spatter on the wall of the living room and walking drips measuring a vertical drop distance of 30 cm. There was no body at the location. When investigators interrogated Mr. Dong she reported that Mr. Dead came to his house and started beating on the door.  Mr. Dong opened the door and was attacked by Mr. Dead. Mr. Dong grabbed a baseball bat and hit Mr. Dead in the head.  Mr. Dead then ran away into the woods. Use this data to confirm or dispute the eyewitness account. What would you expect to see if Mr. Dong was telling the truth?What does the high velocity spatter pattern indicate about the events?What does the vertical drip height indicate about the events?
  • 2. 
    What effect does vertical drip height have on the diameter of a blood droplet?
  • 3. 
    White blood cells have proteins on the surface that allow forensics investigators to identify blood types such as A+ or B-
    • A. 

      True

    • B. 

      False

  • 4. 
    White blood cells
    • A. 

      Defend the body from pathogens

    • B. 

      Carry oxygen throughout the body

    • C. 

      Help in clotting blood

    • D. 

      None of these

  • 5. 
    Antibodies attach to antigens on the surface of foreign molecules that have entered the body.
    • A. 

      True

    • B. 

      False

  • 6. 
    Blood typing is less expensive and quicker for analyzing blood evidence than DNA profiling.  Since many different people share the same type, this blood evidence is considered to be
    • A. 

      Class evidence

    • B. 

      Individual evidence

    • C. 

      Trace evidence

    • D. 

      Physical evidence

  • 7. 
    A and B proteins are found on the surface of some red blood cells.  If a person’s blood contains both the A and the B proteins, then he or she has
    • A. 

      Type AB blood

    • B. 

      Type A blood

    • C. 

      Type B blood

    • D. 

      Type O blood

  • 8. 
    When samples of blood from a suspect reacts with A-antibodies and Rh-antibodies and there is no reaction with the B-antibodies.  The suspect blood type is A+
    • A. 

      True

    • B. 

      False

  • 9. 
    Results from a blood type antibody test are in the table below.  What is the individuals blood type if a negative symbol represents that the antibody at the top of each column did not react with the blood sample when added to the test tube.Blood TypeA Antibody B AntibodyRh Antibody ---
    • A. 

      O-

    • B. 

      AB+

    • C. 

      O+

    • D. 

      AB-

  • 10. 
    A drop of blood dropped from 200 cm will be _____________________ than a blood dropped from 25 cm.
    • A. 

      Larger and have more satellites

    • B. 

      Smaller and have more satellites

    • C. 

      Larger and have less satellites

    • D. 

      Smaller and have less satellites

  • 11. 
    A blood drop that strikes a surface at 10-degrees will be __________________ than a blood drop that strikes a surface at 80-degrees. 
    • A. 

      Longer and thinner

    • B. 

      Longer and wider

    • C. 

      Shorter and thinner

    • D. 

      Shorter and wider

  • 12. 
    A blood droplet has a width of 5mm and a length of 10mm. What angle did the blood droplet strike the surface.  Use the formula to guide you to your answer.  Angle of impact = sin-1 (w/l)
    • A. 

      30 degrees

    • B. 

      0.5 degrees

    • C. 

      60 degrees

    • D. 

      80 degrees

  • 13. 
    Agglutination is the clumping of blood cells caused by an antigen-antibody reaction
    • A. 

      True

    • B. 

      False

  • 14. 
    A two-dimensional view of the intersection of lines formed by drawing a line through the main axis of at least two drops of blood that indicates the general area of the source of the blood splatter.
    • A. 

      Point of origin

    • B. 

      Satellite drop of blood

    • C. 

      Lines of convergence

    • D. 

      Spikes

  • 15. 
    A three-dimensional view formed using lines of convergence and angles of impact of at least two different drops of blood to identify the source and location of blood splatter.
    • A. 

      Lines of convergence

    • B. 

      Point of origin

    • C. 

      Satellite drop

    • D. 

      Spike

  • 16. 
    Cells that police the body by destroying foreign materials in the blood.
    • A. 

      White blood cells

    • B. 

      Red blood cells

    • C. 

      Platelet

    • D. 

      Plasma

  • 17. 
    Doughnut-shaped cells that carry oxygen throughout the body.
    • A. 

      White blood cell

    • B. 

      Red blood cell

    • C. 

      Plasma

    • D. 

      Platelet

  • 18. 
    Secondary drop formed when some blood breaks free from the main contact drop of blood.
    • A. 

      Satellite

    • B. 

      Spike

  • 19. 
    What type of  blood spatter pattern is shown in the diagram?
    • A. 

      Arterial spurt

    • B. 

      Walking Drip

    • C. 

      High Velocity

    • D. 

      Low velocity

  • 20. 
    What terms can be applied to this blood droplet?
    • A. 

      Spines, satellites, 90-degree vertical drip

    • B. 

      Spines, satellites, 15-degree impact angle

    • C. 

      Spines, 90-degree vertical drip

    • D. 

      30-degree vertical drip

  • 21. 
    Which of the following is a test that reacts with blood and emits blue light making it possible to screen large areas for bloodstains?  
    • A. 

      Luminol

    • B. 

      Phenylalanine

    • C. 

      Precipitate

    • D. 

      Hematol

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