What organic molecules comprise most antigens?

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Multiple Choice

What organic molecules comprise most antigens?

Antigen recognition relies on specific features, or epitopes, presented by the molecule. Proteins offer the most diverse and numerous epitopes because of their long amino acid sequences and complex three‑dimensional folding. This variety lets antibodies bind many unique shapes and allows antigen-presenting cells to process protein pieces and display them to T cells, generating a strong and specific immune response. Lipids and nucleic acids are generally less immunogenic on their own, and carbohydrates can be antigens too but often elicit weaker responses unless presented in a protein context. Therefore, proteins comprise most antigens due to their size, complexity, and ability to present multiple distinct epitopes.

Antigen recognition relies on specific features, or epitopes, presented by the molecule. Proteins offer the most diverse and numerous epitopes because of their long amino acid sequences and complex three‑dimensional folding. This variety lets antibodies bind many unique shapes and allows antigen-presenting cells to process protein pieces and display them to T cells, generating a strong and specific immune response. Lipids and nucleic acids are generally less immunogenic on their own, and carbohydrates can be antigens too but often elicit weaker responses unless presented in a protein context. Therefore, proteins comprise most antigens due to their size, complexity, and ability to present multiple distinct epitopes.

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