SBB Human Blood Groups Exam Questions
and Answers Latest Updated 2025 Graded
A+
This antigen is associated with linear carbohydrate chains - ✔✔i antigen
The following reactions are found on a 35-year old male. Anti-A=4+, Anti-B=0, Anti-A,B=4+, A1 cells=3+,
B cells=4+, O cells=3+. How could these results be explained? - ✔✔Anti-M in plasma
Anti-IH would react best with which red blood cells? - ✔✔O RBCs
The acquired B phenomenon is only found in what ABO group? - ✔✔A blood group
A2 subgroup - ✔✔Anti-A1 does not react. 1-8% of persons will produce Anti-A1
Anti-Lu3 is associated with - ✔✔Recessive type Lu(a-b-)
The dominant Lu(a-b-) type is associated with what gene? - ✔✔In(Lu)
What substance could be used to rule out anti-E in the presence of anti-Lub? - ✔✔DTT
Which pair of Lu alleles go together - ✔✔Lu8 and Lu14
Lu6 and Lu9
Au^a and Au^b
Persons who are group B are more common among which population? - ✔✔Black/Asian
Red cells that lack glycophorin A, also lack - ✔✔En^a antigens
, Anti-ENKT reacts with which RBCs? - ✔✔En^a FS
What is a lectin? - ✔✔Seed extracts that agglutinate human cells with moderate specificity.
All of the following are representative of the Lewis antibodies - ✔✔They can be neutralized by Lewis
substance; They occur frequently in pregnant women; They re enhanced by enzymes
Why can anti-H sometimes be found in A2B persons? - ✔✔The specific immunodominant sugar blocks
the presence of H antigen.
Why is determination of Rh status crucial for obstetric patients - ✔✔All Rh negative mother s are
possible candidates for Rhogam
Red cells that phenotype as Le(a-b-) will convert to Le(a+b-) when incubated with plasma from an adult
containing? - ✔✔Le(a+) substance
What genotype does hh represent - ✔✔Bombay
The Rh gene is located on which chromosome? - ✔✔Chromosome 1
Why are Lewis antibodies not implicated in hemolytic disease of the newborn? - ✔✔Lewis antigens are
poorly developed at Birth
What substances would be present in the saliva of a person with the LeLe HH SeSe AA genotype - ✔✔A,
H, Lea, Leb
How is Le(b) substance formed - ✔✔L fucose is added to subterminal N acetylglucosamine of type 1H
substance
A person with the Oh phenotype can only receive red cell transusion from? - ✔✔Oh persons
What amino acid is specific for the S antigen? - ✔✔Methionine
What is true regarding the U antigen? - ✔✔Most U negative are also S-s-; Resistant to enzyme
treatment. U negative is found among African Americans
and Answers Latest Updated 2025 Graded
A+
This antigen is associated with linear carbohydrate chains - ✔✔i antigen
The following reactions are found on a 35-year old male. Anti-A=4+, Anti-B=0, Anti-A,B=4+, A1 cells=3+,
B cells=4+, O cells=3+. How could these results be explained? - ✔✔Anti-M in plasma
Anti-IH would react best with which red blood cells? - ✔✔O RBCs
The acquired B phenomenon is only found in what ABO group? - ✔✔A blood group
A2 subgroup - ✔✔Anti-A1 does not react. 1-8% of persons will produce Anti-A1
Anti-Lu3 is associated with - ✔✔Recessive type Lu(a-b-)
The dominant Lu(a-b-) type is associated with what gene? - ✔✔In(Lu)
What substance could be used to rule out anti-E in the presence of anti-Lub? - ✔✔DTT
Which pair of Lu alleles go together - ✔✔Lu8 and Lu14
Lu6 and Lu9
Au^a and Au^b
Persons who are group B are more common among which population? - ✔✔Black/Asian
Red cells that lack glycophorin A, also lack - ✔✔En^a antigens
, Anti-ENKT reacts with which RBCs? - ✔✔En^a FS
What is a lectin? - ✔✔Seed extracts that agglutinate human cells with moderate specificity.
All of the following are representative of the Lewis antibodies - ✔✔They can be neutralized by Lewis
substance; They occur frequently in pregnant women; They re enhanced by enzymes
Why can anti-H sometimes be found in A2B persons? - ✔✔The specific immunodominant sugar blocks
the presence of H antigen.
Why is determination of Rh status crucial for obstetric patients - ✔✔All Rh negative mother s are
possible candidates for Rhogam
Red cells that phenotype as Le(a-b-) will convert to Le(a+b-) when incubated with plasma from an adult
containing? - ✔✔Le(a+) substance
What genotype does hh represent - ✔✔Bombay
The Rh gene is located on which chromosome? - ✔✔Chromosome 1
Why are Lewis antibodies not implicated in hemolytic disease of the newborn? - ✔✔Lewis antigens are
poorly developed at Birth
What substances would be present in the saliva of a person with the LeLe HH SeSe AA genotype - ✔✔A,
H, Lea, Leb
How is Le(b) substance formed - ✔✔L fucose is added to subterminal N acetylglucosamine of type 1H
substance
A person with the Oh phenotype can only receive red cell transusion from? - ✔✔Oh persons
What amino acid is specific for the S antigen? - ✔✔Methionine
What is true regarding the U antigen? - ✔✔Most U negative are also S-s-; Resistant to enzyme
treatment. U negative is found among African Americans
