Blood Detection and Blood Spatter Analysis
TEST| Questions with 100% Correct Answers
Precipitin test - Answer Detects species-specific blood by forming a precipitate
How to preform Precipitin test - Answer -- Human blood is injected into a rabbit.
-- The rabbit's immune system produces antibodies to fight the invasion of foreign
ingredients in its bloodstream.
-- Recover the rabbit's serum containing antibodies that will bind only to ingredients
of human blood. This serum is referred to as human antiserum.
-- Layer some test blood on top of the serum containing antibodies
for human blood in a small tube.
- A ring of precipitate (cloudiness) at the interface indicates
a positive test for human blood.
- No other type of blood (cat, dog, chicken, cow, pig, etc.)
will form a precipitate when in contact with human
antiserum
Blood Types - Answer Humans have three named antigens on their red blood cells: A, B,
and D.
If you have type A blood: - Answer Your red blood cells have A antigens.
Your antibodies in the blood fluid are type-B antibodies.
If you have type B blood: - Answer Your red blood cells have B antigens.
, Your antibodies in the blood fluid are type-A antibodies.
Coexistence of A antigens and type-B antibodies is possible in the same blood because
they do not bind to each other.
If you have AB blood: - Answer Your red blood cells have A and B antigens.
Your antibodies in the blood fluid have NO antibodies.
If you have O blood: - Answer Your red blood cells have NO antigens.
Your antibodies in the blood fluid are A and B antibodies.
A, B, and D antigens - Answer Antigens on red blood cells
Antibodies - Answer are not found on red blood cells. Instead, they are present in the
plasma itself. Antibodies help to recognize and neutralize foreign substances in the
body. They do not affect the shape of blood drops or antigens in plasma.
Combinations of antigens and antibodies - Answer Determine blood type
Rh Factor (D Antigen) - Answer D antigen present (positive) or absent (negative)
B positive: - Answer Contains both B and D antigens.
O positive: - Answer Contains only D antigens (no A nor B).
AB negative: - Answer Contains both A and B antigens but not D.
Blood is a complex mixture - Answer whose ingredients can be part of the fluid portion
(plasma) or the solids.
TEST| Questions with 100% Correct Answers
Precipitin test - Answer Detects species-specific blood by forming a precipitate
How to preform Precipitin test - Answer -- Human blood is injected into a rabbit.
-- The rabbit's immune system produces antibodies to fight the invasion of foreign
ingredients in its bloodstream.
-- Recover the rabbit's serum containing antibodies that will bind only to ingredients
of human blood. This serum is referred to as human antiserum.
-- Layer some test blood on top of the serum containing antibodies
for human blood in a small tube.
- A ring of precipitate (cloudiness) at the interface indicates
a positive test for human blood.
- No other type of blood (cat, dog, chicken, cow, pig, etc.)
will form a precipitate when in contact with human
antiserum
Blood Types - Answer Humans have three named antigens on their red blood cells: A, B,
and D.
If you have type A blood: - Answer Your red blood cells have A antigens.
Your antibodies in the blood fluid are type-B antibodies.
If you have type B blood: - Answer Your red blood cells have B antigens.
, Your antibodies in the blood fluid are type-A antibodies.
Coexistence of A antigens and type-B antibodies is possible in the same blood because
they do not bind to each other.
If you have AB blood: - Answer Your red blood cells have A and B antigens.
Your antibodies in the blood fluid have NO antibodies.
If you have O blood: - Answer Your red blood cells have NO antigens.
Your antibodies in the blood fluid are A and B antibodies.
A, B, and D antigens - Answer Antigens on red blood cells
Antibodies - Answer are not found on red blood cells. Instead, they are present in the
plasma itself. Antibodies help to recognize and neutralize foreign substances in the
body. They do not affect the shape of blood drops or antigens in plasma.
Combinations of antigens and antibodies - Answer Determine blood type
Rh Factor (D Antigen) - Answer D antigen present (positive) or absent (negative)
B positive: - Answer Contains both B and D antigens.
O positive: - Answer Contains only D antigens (no A nor B).
AB negative: - Answer Contains both A and B antigens but not D.
Blood is a complex mixture - Answer whose ingredients can be part of the fluid portion
(plasma) or the solids.
