The Antigen Receptor on a T Cell Recognizes a Degraded

question 14

Multiple Choice

The antigen receptor on a T cell recognizes a degraded fragment of a protein (i.e., a peptide) bound to a specialized cell surface peptide-binding receptor called an MHC molecule. One key aspect of this system is that the peptides displayed on MHC molecules can be derived from intracellular proteins. This mode of antigen recognition is particularly important in allowing the adaptive immune response to detect infections by:

• A) Large helminthic parasites in the gastrointestinal tract
• B) Intracellular pathogens, such as viruses and some protozoa
• C) Extracellular bacteria that colonize the lungs
• D) Fungi that form hyphae in the bronchial airways
• E) Fungal infections in the skin epithelium

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Household Work Duties

The tasks and responsibilities associated with managing and maintaining a home, including cleaning, cooking, and child care.

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