★ Virus Quiz
Why do viruses have projections on the outside?
A. To send signals to other viruses.
B. To maintain their structure.
C. To attach to the host cell.
D. To reproduce.
Select your answer:

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Immunology › ViewThis type of cell will leave the bone marrow and complete maturation in the spleen
A. hematopoietic stem cell
B. immature B cell
C. pro-B cell
D. pro-T cell
T Cells › View
Explain memory cells?
A. for rapid response to re-exposure
B. cell-mediated immunity or humoral response