An Antigen on an Extracellular Bacterium

question 4

Multiple Choice

An antigen on an extracellular bacterium

• A)is presented after ingestion by an antigen-presenting cell in a class I molecule after binding in the rough endoplasmic reticulum
• B)is presented after ingestion by an antigen-presenting cell after the relevant antigenic peptide has been processed into pieces that are 13-18 amino acids long and the class II molecule has lost the invariant chain in the lysosome and has picked up the processed peptide
• C)is presented after ingestion by an antigen-presenting cell in a class II molecule after binding in the rough endoplasmic reticulum
• D)is presented after ingestion by an antigen-presenting cell after the relevant antigenic peptide has been processed into pieces that are 13-18 amino acids long, and the class I molecule has lost the invariant chain in the lysosome and has picked up the processed peptide

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