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Question

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.
  • So, the correct answer is '5'.

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