Tag: cells in immune system

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Multiple choice zoology immunity phagocytosis cells in immune system immune system, its cells, mediators and antigens

For a T-cell to recognize an antigen, it must interact with

  1. complement

  2. a macrophage

  3. a B-cell

  4. all of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

T cells must be activated by interacting with a professional APC presenting an antigen with their T cell receptor recognizes before they can divide and perform their function. For this, they must interact with a macrophage.

So, the correct option is 'A macrophage'.

Multiple choice zoology immunity phagocytosis cells in immune system immune system, its cells, mediators and antigens

Lymphocytes that activate B-cells and T-cells are

  1. macrophages

  2. cytotoxic T-cells

  3. activator B-cells

  4. helper T-cells
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The three major types of lymphocyte are T cells, B cells and natural killer (NK) cells. Lymphocytes can be identified by their large nucleus. T helper cells(TH cells) assist other white blood cells in immunologic processes, including maturation of B cells into plasma cells and memory B cells and activation of cytotoxic  T cells and macrophages These cells are also known as CD4+ T cells because they express the CD4  glycoprotein on their surfaces. Helper T cells become activated when they are presented with peptide antigens by MHC class two molecules, which are expressed on the surface of antigen- presenting cells (APCs).


So, the correct option is 'Option D'.

Multiple choice zoology immunity phagocytosis cells in immune system immune system, its cells, mediators and antigens

Which of the following options is true regarding the B-cells?

  1. They are incapable of leaving lymph tissue to directly confronta foreign antigen

  2. Antibodies produced by B-cells travel in lymph and blood to react with the foreign antigens

  3. Some may develop into plasma cells that secrete antibodies

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

B- cells are the bone marrow cells which are the major components of the immune response. B-cells are produced in the bone marrow, they migrate to the spleen and other secondary lymphoid tissues. B-cells are responsible for generating antibodies to different antigens. 

So, the correct option is 'All of the above'.