Question

Which of the following is a characteristic of a cytotoxic T cell?

	A) They originate in bone marrow.
	B) They have antibodies on their surfaces.
	C) They are responsible for the memory response.
	D) They recognize antigens associated with MHC I.

Which of the following cells can be classified as a professional antigen presenting cell?

	A) basophils
	B) red blood cells
	C) natural killer cells
	D) dendritic cells

Which of the following destroys virus-infected cells?

	A) cytotoxic T cells
	B) B cells
	C) T helper cells
	D) dendritic cells

What type of immunity results from recovery from mumps?

	A) innate immunity
	B) naturally acquired active immunity
	C) naturally acquired passive immunity
	D) artificially acquired active immunity

What type of immunity results from vaccination?

Question 10 options:

	A) innate immunity
	B) naturally acquired active immunity
	C) naturally acquired passive immunity
	D) artificially acquired active immunity

Answer 1

1. Option D is correct

Explanation : A cytotoxic T cell (also known as T_C, cytotoxic Tlymphocyte, CTL, T-killer cell, cytolytic T cell, CD8+T-cell or killer T cell) is a T lymphocyte (a type of white blood cell) that kills cancer cells, cells that are infected (particularly with viruses), or cells that are damaged in other ways.

When these cells are infected with a virus (or another intracellular pathogen), the cells degrade foreign proteins via antigen processing. These result in peptide fragments, some of which are presented byMHC Class I to the T cell antigen receptor (TCR) on CD8+ T cells.

2.Option D is correct

Explanation : The expression of co-stimulatory molecules and MHC class II are defining features of professional APCs. All professional APCs also express MHC class I molecules as well.

The main types of professional antigen-presenting cells are dendritic cells, macrophages and B cells.

3. Option A is correct

Explanation : A cytotoxic T cell (also known as T_C, cytotoxic T lymphocyte, CTL, T-killer cell, cytolytic T cell, CD8+ T-cell or killer T cell) is a T lymphocyte (a type of white blood cell) that kills cancer cells, cellsthat are infected (particularly with viruses), or cells that are damaged in other ways.

The presence of foreign (viral) proteins on the the target cell surface. The combination of a viral protein (the foreign antigen) and the Class I MHC protein on a cell's surface indicates that the cell has been infected by a virus.

4. Option B is correct

Explanation : After the recovery of the disease Mumps, the body gets the Naturally Acquired Active Immunity. Since it is happening after the disease, it is called active.

5. Option D is correct

Explanation : A vaccination process is not inbuilt in our immune system, it is thus artificially put into our body. Also it works when the time needed i.e. when pathogen attacks thats why it is passive in nature.