1. All the following represent characteristics of the adaptiveimmune system EXCEPT:

1. all the above is true, no exceptions
2. secondary response characterized by rapid destruction of thepathogen
3. recognition by pattern recognition receptors
4. development of memory response
5. recognition of individual antigens and epitopes

1. Intravenous immunoglobin therapy is being used as a treatmentfor severely affected Covid-19 patients. This infusion of antibodyisolated from the blood of individuals who recovered from theinfection would predominantly be which class of antibody?

1. IgS
2. None of the answers are correct
3. IgG
4. IgM
5. IgD
6. IgB

1. Immunoglobulins consist of four polypeptides; effectorfunctions result when certain immune system components

1. Interact with the variable domains of both the lightchains
2. Interact with the variable domains of both the heavychains
3. Interact with the constant domains of both the light and heavychains
4. Interact with the constant domains of both the lightchains
5. None of the above

1. Which of the following apply to T_h cell recognitionand response to antigen?

1. Recognition of antigen displayed by MHC I with secretion ofcytokines in the presence of IL-2
2. Recognition of PAMPs by the col-like receptors
3. Recognition antigen in the absence of MHC molecules withsecretion of antibody
4. None of the answers apply
5. Recognition of antigen displayed by MHCI with secretion ofcytokines that include IL-2