An individual is found to be unable to ward off bacterial infection. However, upon examination, it is discovered that this individual has no problem producing specific antibodies against bacterial proteins. What might be an underlying problem?
a. the immune system of this individual regards bacterial protein as self proteins.
b. there are defects in the helper T cells system.
c. there is a mutation in one of the immunoglobulin variable region genes.
d. there is a mutation in one of the immunoglobulin constant region genes.
e. certain B cells have suffered clonal deletion.
In a blood test, an individual’s blood clumped when anti-B antibodies were applied. What is the blood type of this individual?
a. neither type B nor type AB.
b. neither type A nor type AB.
c. either type B or type AB.
d. either type A or type AB.
e. type O.
An AB blood type individual carries antibodies against:
a. antigen A.
b. antigen B.
c. antigen O.
d. antigens A, B and O.
e. none of the above.
a. the immune system of this individual regards bacterial protein as self proteins.
b. there are defects in the helper T cells system.
c. there is a mutation in one of the immunoglobulin variable region genes.
d. there is a mutation in one of the immunoglobulin constant region genes.
e. certain B cells have suffered clonal deletion.
In a blood test, an individual’s blood clumped when anti-B antibodies were applied. What is the blood type of this individual?
a. neither type B nor type AB.
b. neither type A nor type AB.
c. either type B or type AB.
d. either type A or type AB.
e. type O.
An AB blood type individual carries antibodies against:
a. antigen A.
b. antigen B.
c. antigen O.
d. antigens A, B and O.
e. none of the above.