Forensic Exam 3

Front 1

Which type of blood cellsare needed for DNA typing

Back 1

a. White blood cells (WBCs)

Front 2

What follows a presumptivetest to establish the identification of blood? >

Back 2

b. Confirmatory test.

Front 3

The bodily fluid detectedthe least by forensic laboratories is..

Back 3

Urine

Front 4

If your blood type is B-,what does that mean?

Back 4

c. Your red bloodcells are blood type B- in the ABO system.

Front 5

Where is nuclear DNA found?

Back 5

a. Mitochondria

e. nucleus of a cell

f. hair follicle.

only a, e and f are correct

Front 6

Defined as the force that pulls the surface molecules of a liquid toward its interior,decreasingthe surface area and causing the liquid to resist penetration?

Back 6

b. Surface Tension

Front 7

What is the normal clotting time of blood that has exited the body from healthy individuals?

Back 7

c. 3-15 minutes

Front 8

What are areas or patterns that result from the absence of bloodstains in otherwise continuous spatters of staining?

Back 8

d. void patterns

Front 9

Luminolis best used in what kind of environment?

Back 9

a.Darkened

Front 10

In normal individuals what percentage of blood is comprised of cellular components?

Back 10

b.45%

Front 11

What is the range of the total volume of blood in healthy individuals?

Back 11

c. 4.5 – 6.0 liters

Front 12

Whatis defined as the resistance to change of form or flow?

Back 12

c. Viscosity

Front 13

Blood will not break into smaller droplets or spatters unless what is disrupted?

Back 13

A.specific gravity

Front 14

What is determined by examining the edge characteristics of individual stains?

Back 14

A.direction of flight

Front 15

Whatdegree of impact is associated with a circular shape?

Back 15

d. 90%

Front 16

Themisting effect is a pattern associated with what?

Back 16

a. Gunshot

Front 17

Whatpatterns have a linear directionality associated with them?

Back 17

a.castoff

Front 18

Whatis the correct series of color changes for a bloodstain as it ages?

Back 18

b. Red→Reddish Brown→Black

Front 19

Whatbloodstain alteration results in bloodstains being diluted?

Back 19

a. Moisture

Front 20

The size, quantity, and distribution of blood spatters vary depending on what?

Back 20

a. quantity of blood subjected to impact*

c. force of the impact*

d. texture of the surface impacted by the blood

e. Only a, c, and d are correct.

Front 21

Bloodstains should be categorized relative to what?

Back 21

a. the events thatproduced them

Front 22

What does active blood staining consist of?

Back 22

b. impact spatter

c. arterial spurts

d.expirated blood

Front 23

Two dimensional perspective

Back 23

area of convergence

Front 24

locationof the blood source in a three- dimensional perspective

Back 24

areaof origin

Front 25

determinedby the narrow end of elongated bloodstain

Back 25

direction of travel/directionality

Front 26

-canbe calculated by using a mathematical relationship

-thatexists between the width and length of an elliptical

Back 26

Angle of impact

Front 27

Forensic serology can be defined as theexamination and analysis of

Back 27

c.Bodily Fluids

Front 28

________ isneeded for the transport of oxygen and _______ is needed for clotformation

Back 28

b.Hemoglobin; platelets.�

Front 29

Which type of blood cells are needed for DNAtyping

Back 29

a.White blood cells(WBC)

Front 30

What is achromogene?

Back 30

c.. A substance capable of generating a coloredspecies.

Front 31

Which is notan example of a presumptive test?

Back 31

d. Microcrystal Test.

Front 32

Which presumptive test was the most used before it was identified as acarcinogen?

Back 32

a.Benzidine

Front 33

What follows apresumptive test to establish the identification of blood?

Back 33

b.Confirmatory test.

Front 34

Confirm blood is present when results are positive

Back 34

True

Front 35

Eliminate stains from further consideration when test is negative

Back 35

True

Front 36

Catalyticcolor tests use chemical oxidation of a chromogenic substance by an oxidizingagent catalyzed in the presence of blood, specifically hemoglobin

Back 36

True

Front 37

CatalyticColor Tests do not result in false positive results

Back 37

False

Front 38

Phenolphtaleincolor produces pink color for blood is a confirmatory testbody

Back 38

False

Front 39

When blood presence is suspected, but little is tobe seen, luminol and fluorescein may be used.

Back 39

True

Front 40

Confirmatorytests for blood included Typesof test include:

Back 40

–Teichmann Test

–Takayama Test (more effective)

Front 41

Plasma

Back 41

-Straw clored

-90% water

-contains electrolytes

-helps regulate body temp

-transports blood cells and hormones throughout the body

Front 42

Erythrocytes

Back 42

-Heme

-Phagocyte

-no nucleus

Front 43

White blood cells

Back 43

-nucleus

-Luminol

-DNA

Front 44

Platelets

Back 44

-clotting

Front 45

Luminol

Back 45

Luminol is mixed with oxidant in an aqueous solution

•Mixture is sprayed over area

•Catalytic activity of the heme group acceleratesoxidation of luminol, producing ablue-white to yellowish green light when blood is present

•Luminol is extremely sensitive to presence ofblood

Front 46

Fluorescence

Back 46

•Fluorescein works similarly to luminol

•Fluorescein which has a commercial thickener can adhere to verticalsurfaces

• Fluorescein requires use of an alternate light source, which typicallyis set at 450 nanometers•Fluorescein will not fluoresce with household bleach, while luminoldoes.