# Unit 4 Exam Immunology

With regard to the type of B-cell response generated, protein antigens typically provoke which of the following responses?
A) TI-1
B) TI-2
C) TD
D) Both A and B
E) None of the above
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Activated TH cells signal to B cells to initiate their activation program via which of the following?
A) CD40L on the T cell to CD40 on the B cell
B) CD40 on the T cell to CD40L on the B cell
C) FasL on the T cell to Fas on the B cell
D) Fas on the T cell to FasL on the B cell
E) Notch ligand on the B cell to notch-1 on the T cell
Which of the following mechanisms of mutagenesis via AID activity is possible?
A) The lesion is not repaired prior to replication, resulting in a CG→TA transition.
B) Base excision repair, followed by error-prone DNA polymerase fill-in of the gap created.
C) Mismatch repair, followed by error-prone DNA polymerase fill-in of the gap created.
D) Choices A and B are both possible.
E) All of the above are possible.