1. Antigens are made up of specific sequences of amino acids called ----- that determine their structure.
A. epitopes
B. multivalent sites
C. paratropes
D. constant regions
2. Which scenario best describes antibody cross-reactivity?
A. A single pathogen with multiple epitopes is recognized by a multivalent antibody.
B. Multipleepitopes are recognized by multiple antibodies
C. A single epitope is recognized by multiple antibodies
D. Two distinct, but structurally similar epitopes are recognized by the same antibody
3. What is the major benefit of cross-reactivity?
A. Cross-reactivity permits the allergic response.
B. Cross-reactivity promotes a faster immune response against unrelated pathogens.
C. Cross-reactivity enhances immunity by providing protection against related pathogens.
D. Cross-reactivity allows the immune system to respond to pathogens in various locations within the host (i.e., skin, mucosal tissues, extracellular fluids, etc.)

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