Exams › NEET › Biology

Blood group A has Antigen-A & antibody ‘b’ or anti A or a, Blood group B has antigen-B & antibody a or anti B or b. Blood group AB has antigen-A & B and no antibody.

1. Neutrophils are a type of leucocyte (WBCs) that can take all types of stain (Acidic-Basic-Neutral). It is most abundant (60-70% of total WBCs) and most active type of WBCs. Neutrophil helps heal damaged tissues and resolve infections. Its levels increases naturally in response to infections, injuries and other types of stress.
2. A has antigen A & antibody b so it can have the same blood group. O has no antigen & antibodies a & b so it is called universal donor.
3. Removal of calcium from freshly collected blood would prevent clotting because the process of blood clotting starts when prothrombinase (an enzyme formed by thromboplastin) catalyses the conversion of prothrombin (an inactive protein in the blood plasma) into thrombin (active protein) and this reaction takes place in the presence of Ca²⁺. Now this thrombin converts fibrinogen into fibrin which makes fibrin threads on polymerisation & with blood corpuscles, it’ll prevent clotting. It may also be done by adding some anti coagulants, eg. sodium & potassium oxalates in blood as they precipitate Ca²⁺ present in the blood.
4. Lymph differs from blood in that it contains less protein and no red blood cells. Lymph contains white blood cells.

Correct answer: A has antigen A & antibody b so it can have the same blood group. O has no antigen & antibodies a & b so it is called universal donor.

Solution

The correct choice states that blood group A has antigen A and anti-B antibodies, so it can receive the same blood group. It also correctly identifies group O as having no A or B antigens, making it the universal donor in the ABO system.

Related NEET Biology questions

• Which is true about the difference between cortical and juxtamedullary nephrons?
• Which one of the following is correct?
• Erythropoiesis starts in:
• Person with blood group AB is considered as universal recipient because he has:
• Adult human RBCs are enucleated. Which of the following statement(s) is/are most appropriate explanation for this feature? (1) They do not need to reproduce (2) They are somatic cells (3) They do not metabolize (4) All their internal space is available for oxygen transport
• All the components of the nodal tissue are autoexcitable. Why does the SA node act as the normal pacemaker?

⚔️ Practice NEET Biology free + battle 1v1 →