How many classes of immunoglobulin are present in humans?
A
3
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B
4
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C
5
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D
6
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Solution
The correct option is C 5
An antibody (Ab), also known as an immunoglobulin (Ig), is a large, Y-shaped protein produced mainly by plasma cells that are used by the immune system to neutralize pathogens such as pathogenic bacteria and viruses.
The antibody recognizes a unique molecule of the pathogen, called an antigen, via the fragment antigen-binding (Fab) variable region.
Antibodies can come in different varieties known as isotypes or classes. In placental mammals, there are five antibody isotypes or classes known as IgA, IgD, IgE, IgG, and IgM.
Hence, they are five classes of immunoglobulin that are present in humans.