Question

Which of these are present in the plasma of a person having ‘O’ blood group?

(a) Anti-A and anti-B

(b) Anti-A

(c) Anti-B

(d) Antibodies are absent

This question was posed to me during an internship interview.

This is a very interesting question from Body Fluids in portion Body Fluids and Circulation of Biology – Class 11

Answer 1

The correct option is (a) Anti-A and anti-B

Best explanation: For people having ‘O’ blood group, their red blood cells do not have any surface antigens. However, the antibodies anti-A and anti-B are present in the plasma of people having this blood group.