Which one of the following statements about the immune system is true ? is the a
ID: 218777 • Letter: W
Question
Which one of the following statements about the immune system is true? is the answer C?
Recombination of genes to produce functional B-cell receptors occurs immediately after exposure to antigen.
Helper T-cells bind to type I MHC proteins and cytotoxic T-cells bind to type II MHC proteins.
The major histocompatibility complex codes for a large group of cell surface glycoproteins.
Plasma cells secrete IgM molecules early, and then IgD molecules later.
Interferons specifically protect body cells against attack by parasites.
A.Recombination of genes to produce functional B-cell receptors occurs immediately after exposure to antigen.
B.Helper T-cells bind to type I MHC proteins and cytotoxic T-cells bind to type II MHC proteins.
C.The major histocompatibility complex codes for a large group of cell surface glycoproteins.
D.Plasma cells secrete IgM molecules early, and then IgD molecules later.
E.Interferons specifically protect body cells against attack by parasites.
Explanation / Answer
Yes - The major histocompatibility complex codes for a large group of cell surface glycoproteins - The glycoproteins are called MHC molecules which are expressed on the cell surface of all nucleated cells. Upon exposure to antigen, antibodies are produced immediately. Cytoxic T cells bing MHC I and helper T cells bing to type Ii. IgD is secreted earlier than IgM. Interferons not only protects the body against parasites, it also protects against bacteria viruses and tumor cells.
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