Question

Which of the following molecules is a B cell co-receptor that brings antibody to the cell surface and participates in signal transduction.

1. CR2

2. Ig alpha and beta

3. CD81

4. CD19

5. CD3

Which of the following is a serial killer:

1. B cells

2. mast cells

3. macrophages

4. T cells

5. dendritic cells

Which of the following is one of the signals centrocytes need to survive?

1. Bind to an Ag on a follicular macrophage

2. Present Ag to a T-follicular helper cell and receive co-stimulator "T-cell help" from T-cell.

3. IL-2

4. CTLA-4

5. None of the above

Which of the following is an immune response activated by TH17 cells?

1. enhanced neutrophil responses

2. B cell activation and proliferation

3. cytotoxic T cells

4. natural killer cells

5. macrophage killing of intravesicular pathogens

Answer 1

Question: Which of the following molecules is a B cell co-receptor that brings antibody to the cell surface and participates in signal transduction.

The correct answer is: CD19

Explanation: CD19 is a B cell co-receptor that brings antibody to the cell surface and participates in signal transduction because CD19 is primarily responsible for signal transduction.

Question: Which of the following is a serial killer?

The correct answer is: T Cells

Explanation: T cell is a serial killer because the T cells are having the ability of sequentially killing multiple targets. For example, recombinant protein which divert T cells to tumor antigens, as a result, T cells activation which kill multiple tumor targets.

Question:  Which of the following is one of the signals centrocytes need to survive?

The correct answer is: Present Ag to a T-follicular helper cell and receive co-stimulator "T-cell help" from T-cell.

Explanation: Signals centrocytes need to survive Present Ag to a T-follicular helper cell and receive co-stimulator "T-cell help" from T-cell.Whene B cells have stopped proliferating , they are known as centrcytes. The centrocytes compete for survival signals came from T-follicular helper cell. This survival process depends on the affinity of their surface antibody to the antigen.

Question: Which of the following is an immune response activated by TH17 cells?

The correct answer is: macrophage killing of intravesicular pathogens

Explanation: because they activate the microbe killing capacity of macrophages along with interleukin(IL).