Question

WILL FAN& MEDAIL

okey so I had this question in IBO 2001:

A 59. Erythrocytes of man with blood group A are mixed with blood plasma
of another man. No agglutination is observed. It can be concluded that the
blood group of the plasma donor is:
A. only B.
B. A or 0.
C. A or AB.
D. A, B or 0.

The answer page said C but shouldn't the answer be B as 0 can give to any blood type and A can mix with A?

Answer 1

I think it is B as well, could it be that the answer page was wrong?

Answer 2

Blood type A has anti-B antibodies and blood type B has anti-A antibodies. They interfere with each other - the antibodies start to invade and destroy eachother's red blood cells and cause clumping.

Answer 3

Blood group A has only A antigen on red cells (and B antibody in the plasma)
Blood group b has only B antigen on red cells (and A antibody in the plasma)
Blood group AB has both A and B antigens on red cells (but neither A nor B antibody in the plasma)
Blood group o has neither A nor B antigens on red cells (but both A and B antibody are in the plasma)

Answer 4

So I think the answer given should be right !

Answer 5

yea i know but how could the answer be C then?

Answer 6

so it is B?

Answer 7

yes i think it is B

Answer 8

no C is correct. !

Answer 9

When u have A antigen anti-A antibodies will not be produced by them .if B type blood is injected into their systems, anti-B antibodies in their plasma will recognize it as alien and burst or agglutinate the introduced red cells in order to cleanse the blood of alien protein.

Answer 10

okey so the guy has A so B antigens how could it be that the donor blood has AB like C answer suggests

Answer 11

Blood group AB has both A and B antigens on red cells (but neither A nor B antibody in the plasma)
So if A blood was mixed with this it won't identify it as an alien.

Answer 12

but the answers say the donor blood right? A is de receptor

Answer 13

so if AB gets into A wont the receptor blood agglumerate because A got anti-B

Answer 14

nIn AB u don't find either A or B antibodies . So even if u add B blood no change will occur. :)

Answer 15

when AB is the one receiving A or B indeed but not when it is the donor blood right? because A and B have antibodies against the opposite thing

Answer 16

Blood group A has B antibodies
Bloood group B has A antibodies
Blood group AB has no A or B antibodies
Blood group O has both A and B antibodies !

Answer 17

yeah and the receptor has A so has B antibodies right?

so if AB gets injected it agglumerates right?