To be an effective antigen, a molecule would ideally be small, and consist of repeating units with similar structure, such as a trisaccharide.
a. True
b. False

These are molecules that are strange to the organism. They originate outside the organism, and depending on the antigen, they can or cannot produce a response. Those that produce an immune response are called immunogens.

Size is significant when talking about the effectiveness of the antigen.

Small-sized molecules might enter the organisms and join antibodies but do not get to activate cells B or T. These are antigens but not immunogens.

Big-sized molecules are the most effective ones and the ones that produce a faster immune response by the organism.

Molecules of a high molecular weight are usually the most immunogenic ones. However, structural complexity plays a significant role as well. Big-sized molecules with low complexity might not be as effective as complex molecules of smaller size.

Proteins are the best antigens, especially complex proteins. Other molecules like lipids, polysaccharides, and nucleic acids might also act as antigens but are not as effective as proteins.

Lipids and nucleic acids are large molecules but with low structural complexity. Hence, they are not as effective antigen as proteins.

The correct answer is otion B. FALSE.

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To be an effective antigen, a molecule would ideally be small, and consist of repeating units with similar structure, such as a trisaccharide. a. True b. False

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What are the antigens?

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To be an effective antigen, a molecule would ideally be small, and consist of repeating units with similar structure, such as a trisaccharide.
a. True
b. False