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Quiz about Forensic Science Part II Serology

Forensic Science Part II: Serology Quiz

This is part 2 of my series of forensic quizzes. Serology mainly deals with blood, semen, saliva, and perspiration. It also deals partially with DNA.

A multiple-choice quiz by toadsworth65. Estimated time: 4 mins.

Author
toadsworth65

Time
4 mins

Type
Multiple Choice

Quiz #
225,012

Updated
Dec 03 21

# Qns
10

Difficulty
Average

Avg Score
7 / 10

Plays
6356

Awards
Top 20% Quiz

Last 3 plays: Guest 4 (8/10), Guest 69 (5/10), Guest 184 (4/10).

One at a Time - Single Page - Timed Game

Question 1 of 10

1. What was one of the problems during early blood tests? (Around 1875) Hint

blood types could not be identified

microscopic examination could not be applied to dried blood

all of these

human blood could not be distinguished from animal blood

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Question 2 of 10

2. Assuming there is no problem with the rhesus factor, can a person with type A blood safely be transfused with type O blood?

Yes

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Question 3 of 10

3. Preliminary tests to identify blood are almost always conclusive.

True

False

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Question 4 of 10

4. Are there any circumstances in which someone's blood type can change?

Yes

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Question 5 of 10

5. Apart from blood, what bodily fluid is usually found in rape cases?

Answer: (One Word, 5 letters)

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Question 6 of 10

6. DNA is found wherever red blood cells are present.

True

False

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Question 7 of 10

7. What system used by the FBI compiles DNA of known violent offenders from all over the nation and can be used to match DNA with a sample found at a crime scene? Hint

AFIS

DNAW

CODIS

CDDB

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Question 8 of 10

8. A person with RH protein on their blood cells can be infused with blood without the RH protein.

True

False

9. Take this scenario:
A woman gets out of bed, watches TV, talks on the phone, pats her cat, and then shoots her husband. She hides the gun and runs away. Which object would be most useful to the forensic serologist in finding out who the woman was? Hint

cat

phone

window sash

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Question 10 of 10

10. You can alter your DNA so it will appear to be different.

True

False

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Quiz Answer Key and Fun Facts

1. What was one of the problems during early blood tests? (Around 1875)

Answer: all of these

In 1875 the main blood test in use was the hematin test. It could not distinguish animal blood from human blood or identify the type of blood.
The guaiacum test then came along.
In the test the suspected blood was put in water. Then guaiacum (a type of tree resin) was added.
Hydrogen peroxide was then put into the container.
If blood was present, a blue color formed.
This test, like the hematin test, could not identify what type of blood it was or tell whether it was human or animal, but it could be applied to small amounts of dried blood.

2. Assuming there is no problem with the rhesus factor, can a person with type A blood safely be transfused with type O blood?

Answer: Yes

At the beginning of the twentieth century, Karl Landsteiner discovered blood types. He found out that a person's blood cells had an antigen and an antibody.
A person with type A antigen has type A blood and has the type B antibody. Therefore if a person with type A blood is transfused with type B blood their blood cells would clump, causing serious problems.
If a person has both antigens their blood type is AB. If they have neither their blood type is O. This is why O can be transfused into anybody. No antibodies mean no clumping on A or B blood cells.

3. Preliminary tests to identify blood are almost always conclusive.

Answer: False

Most preliminary tests look for an enzyme in blood called peroxidase. Unfortunately peroxidase is also found in many other blood resembling substances like shrimp sauce. For this reason, preliminary tests are called "presumptive" tests.

4. Are there any circumstances in which someone's blood type can change?

Answer: Yes

This is an extremely rare occurrence, but it can happen. A blood type can change through an addition or suppression of an antigen through infection or malignancy.

5. Apart from blood, what bodily fluid is usually found in rape cases?

Answer: semen

In criminal cases semen is the second most common fluid that is found at the scene. The first most common is blood. The investigator will usually do a acid phosphatase color test to determine whether or not a fluid is semen.

6. DNA is found wherever red blood cells are present.

Answer: False

DNA is always found where white, not red, blood cells are present (DNA is found only in a cell's nucleus, and red blood cells do not have nuclei.) For this reason, it can be found in blood, semen, saliva, hair root follicles, and more.

7. What system used by the FBI compiles DNA of known violent offenders from all over the nation and can be used to match DNA with a sample found at a crime scene?

Answer: CODIS

The Combined DNA Index System (CODIS) has blood samples of offenders and has solved many cases. CODIS solved a 1993 sexual assualt case by linking that suspect to a 1991 rape case.

8. A person with RH protein on their blood cells can be infused with blood without the RH protein.

Answer: True

In addition to having antigens and antibodies in MOST blood types, you can also have the RH protein. That means that a person without the RH protein (meaning they have a negative blood type) cannot be infused with blood from a person with the RH protein (meaning they have a positive blood type), but a person with the RH protein can be infused with negative blood.

9. Take this scenario: A woman gets out of bed, watches TV, talks on the phone, pats her cat, and then shoots her husband. She hides the gun and runs away. Which object would be most useful to the forensic serologist in finding out who the woman was?

Answer: phone

All of these things would help find out who the woman is, but to the forensic serologist, the phone would be the most handy. When you talk on the phone, little bits of saliva go onto the phone when you talk. White blood cells are found in saliva so the woman's DNA would be on the phone.

10. You can alter your DNA so it will appear to be different.

Answer: False

You are born with your DNA and this isn't "Threshhold". Your DNA cannot change and if someone did try to alter it, you would probably die.

Source: Author toadsworth65

This quiz was reviewed by FunTrivia editor crisw before going online.
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