Question

Mark the correct statement for the O blood group.
A. O has antibodies ‘A’ and ‘B’ with no antigen.
B. O has ‘A’ antigen and ‘B’ antibody.
C. O has ‘B’ antigen and ‘O’ antibody.
D. O has ‘A’ and ‘B’ antigens with no antibody.

Answer 1

Blood is a body fluid present in animals that help in the delivering of nutrients and oxygen to the tissues and transport carbon dioxide and metabolic wastes away from the cells or tissues.

Complete Answer:
Blood group: Blood group is a classification of blood based on the presence or absence of antigenic substances on the surface of the Red Blood Cells (RBC).
- These antigenic substances may be proteins, carbohydrates, glycolipids, etc depending on the type of blood group system. Blood types are inherited from both of the parents in the offsprings.

Blood group systems:
There are two most important blood group systems-
1. ABO blood group system – This system determines someone's blood type as A, B, AB, or O.
2. Rh blood group system – Rh refers to the Rhesus factor. This blood group system determines whether someone's blood group is positive or negative.
Differences between A, B, AB and O blood groups:

Sl.No	Blood group	Antibodies in plasma	Antigens on the surface of RBCs
1	Group A	Anti - B	A antigen
2	Group B	Anti - A	B antigen
3	Group AB	None	A antigen and B antigen
4	Group O	Anti – A and Anti - B	None

Hence, option A is the correct answer for this question.

Note: Whose blood group is O is called a universal donor as they have no antigens. And the person with AB blood group is called as universal acceptors because they have no antibodies present in those persons. Determination of blood type helps in the blood transfusion.