Question

multiple choice question
anti-b agglutinins are found in people with which blood type(s)?

a and o
a only
a and b
b only

Explanation:

To determine where anti - B agglutinins are found, we use the knowledge of blood types and agglutinins:

• Blood type A: Has A antigens on red blood cells. In the plasma, it has anti - B agglutinins (to avoid agglutination with B antigens).
• Blood type O: Has no A or B antigens on red blood cells. In the plasma, it has both anti - A and anti - B agglutinins.
• Blood type B: Has B antigens on red blood cells. In the plasma, it has anti - A agglutinins (not anti - B).
• Blood type AB: Has both A and B antigens on red blood cells. In the plasma, it has no agglutinins (to avoid agglutinating its own antigens).

So, anti - B agglutinins are present in blood types A and O.

Answer:

A. A and O