Could someone answer this question :
How do B-lymphocytes differ from T-lymphocytes?
A Only B-lymphocytes attack cells infected with microorganisms
B Only B-lymphocytes attack cells from transplanted organs
C Only B-lymphocytes produce suppressor cells
D Only B-lymphocytes produce memory cells
The answer is D
That is from a CIE mCQ past paper.
There is no 'proof" that T memory cells exist, nor do the B cells respond to transplanted organs.
The responce to organs etc are via cell mediated immunity, not the B cells.
A is definatly wrong, and so is C.
Dinesh, I would myself have chosen D, but I am quite sure it is definetly wrong. This is because of two reasons: (1) I have the CIE Biology AS & A-Level book and it states that T memory cells are produced, (2) I have the CIE Teacher Support CD which has a syllabus breakdown and it cleary states: 'If students understand how B- and T-cells react to exposure to antigen, then this topic is not difficult to understand. They should be aware that both B- and T-cells produce memory cells.'
I think it might be A, though i'm not sure, because, B-lymphocytes do not directly attack infected cells (their antibodies do), but T-killer cells directly attack infected cells.
I was doing this in college today and Im pretty sure its not A, I think it might be C but we didn't get very far into it so I might be wrong.
Well, I searched for T suppressor cells on Google and they do exist.
It has to either A or B because in the Paper 1 for the next year the following question appears:
B-Lymphocytes of the immune system differ from T-Lymphocytes because only B-lymphoctyes:
A attack cells infected by microorganisms.
B attack cells from transplanted organs.
C produce antibodies and memory cells.
D produce suppressor and memory cells.
Since both B-&T-lymph. produce memory cells it has to be A or B.