the correct answers marked in bold black can i know why the option correct and why other options

Step 1: Epitope is defined as specific regions on antigens that interact with antibodies.

Question

1) Which of the following is the best definition of epitope? A) specific regions on antigens that interact with T-cell receptors (technically T-cell receptors recognize the epitope with MHC) B) specific regions on antigens that interact with MHC class molecules C) specific regions on antigens that interact with haptens D) specific regions on antigens that interact with antibodies E) specific regions on antigens that interact with perforins 2) CD4 + T cells are activated by A) interaction between CD4 + and MHC II. B) interaction between TCRs and MHC II. C) cytokines released by dendritic cells. D) cytokines released by B cells. E) complement. 3) The antibodies that can bind to large parasites are A) IgG. B) IgM. C) IgA. D) IgD. E) IgE. 4) Which of the following statements concerning B cell receptors (BCRs) is FALSE? A) They are formed in response to an encounter with an antigen. B) They are complementary in shape to a specific antigenic determinant that they may or may not encounter. C) They are bound to the surface of B lymphocytes and have two antigen-binding sites. D) Each B lymphocyte is randomly generated with antibody variable regions that determine its BCR. E) Scientists estimate that each person forms at least 10^11 different types of B lymphocytes with distinct BCRs. 5) The following events elicit an antibody response. What is the third step? A) Antigen-digest goes to the surface of APC. B) APC phagocytizes antigen. C) B cell is activated. D) TH cell recognizes antigen-digest and MHC II. E) TH cell produces cytokines.

          1) Which of the following is the best definition of epitope?
A) specific regions on antigens that interact with T-cell receptors (technically T-cell receptors recognize the epitope with MHC)
B) specific regions on antigens that interact with MHC class molecules
C) specific regions on antigens that interact with haptens
D) specific regions on antigens that interact with antibodies
E) specific regions on antigens that interact with perforins

2) CD4 + T cells are activated by
A) interaction between CD4 + and MHC II.
B) interaction between TCRs and MHC II.
C) cytokines released by dendritic cells.
D) cytokines released by B cells.
E) complement.

3) The antibodies that can bind to large parasites are
A) IgG.
B) IgM.
C) IgA.
D) IgD.
E) IgE.

4) Which of the following statements concerning B cell receptors (BCRs) is FALSE?
A) They are formed in response to an encounter with an antigen.
B) They are complementary in shape to a specific antigenic determinant that they may or may not encounter.
C) They are bound to the surface of B lymphocytes and have two antigen-binding sites.
D) Each B lymphocyte is randomly generated with antibody variable regions that determine its BCR.
E) Scientists estimate that each person forms at least 10^11 different types of B lymphocytes with distinct BCRs.

5) The following events elicit an antibody response. What is the third step?
A) Antigen-digest goes to the surface of APC.
B) APC phagocytizes antigen.
C) B cell is activated.
D) TH cell recognizes antigen-digest and MHC II.
E) TH cell produces cytokines.

Added by Morgan M.

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