Adaptive Immunity - OpenStax A&P 2e Ch21

What is the first step in adaptive immunity activation?

• Dendritic cell activation

• Virus infects and replicates within the epithelium

• T and B cell priming in the lymph node

• Antibodies and T cells attack viruses

What role do dendritic cells play in the adaptive immunity process?

• They attack viruses directly

• They activate T cells

• They take pathogenic antigens to the lymph node

• They produce antibodies

Where does T and B cell priming occur in the adaptive immunity process?

• In the bloodstream

• In the lymph node

• In the epithelium

• In the bone marrow

What is the final step in the adaptive immunity process?

• Virus infects and replicates within the epithelium

• Dendritic cell activation

• T and B cell priming in the lymph node

• Antibodies and T cells attack viruses

What is the role of the variable region in T cell receptors?

• To bind to MHC molecules

• To create diversity in antigen recognition

• To present antigens to T cells

• To destroy pathogens directly

How many amino acids typically make up an antigenic determinant?

• 10-12

• 8-10

• 6 or fewer

• 15-20

When do T cells recognize antigens?

• When antigens are free-floating

• When presented by MHC molecules on antigen-presenting cells

• When antigens are in the bloodstream

• When antigens are inside the nucleus

What is the characteristic of thymocytes in the Double Negative Stage?

• They express both CD4 and CD8 markers.

• They lack CD4 and CD8 markers.

• They bind strongly to self-antigens.

• They become either CD4+ or CD8+.

During which stage are thymocytes selected to survive based on their ability to bind to self-MHC molecules?

• Double Negative Stage

• Double Positive Stage

• Positive Selection

• Negative Selection

What happens to T cells that bind too strongly to self-antigens?

• They are selected to survive.

• They express both CD4 and CD8 markers.

• They are eliminated by apoptosis.

• They become helper T cells.