Antigens are present :
Correct answer: D. On cell surface
- A. Inside the cytoplasm
- B. On nuclear membrane
- C. Inside the nucleus
- D. On cell surface
Explanation
An antigen is any foreign substance, such as a protein or polysaccharide, present on the external coating of a pathogen, a component of vegetables, fruits, meats, drugs, chemicals, tissues, or organ transplants, which induces the immune system to produce antibodies.
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About Biodiversity and Variety of Life
Biological classification uses taxonomic ranks, binomial nomenclature and shared characteristics to organize life into kingdoms. The major groups include prokaryotes, protists, fungi, plants and animals, with comparisons based on cell type, cell wall, nutrition, body organization, reproduction and evolutionary relationships; prokaryotes lack a membrane-bound nucleus.
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