ATI RN
Immune System Exam Questions Questions
Question 1 of 5
Substances called the are capable of directly inhibiting DNA synthesis
Correct Answer: B
Rationale: Interferons inhibit viral DNA/RNA synthesis; antibodies , complement , and histamines have other roles.
Question 2 of 5
Once expressed on the surface of host cells, an MHC protein remains stably associated with its bound peptide for several days. This highly stable peptide binding behavior is important because:
Correct Answer: A
Rationale: Stable binding ensures MHC reflects intracellular proteins; instability occurs, but decoys or proteases are less relevant.
Question 3 of 5
The inflammatory response produced
Correct Answer: B
Rationale: The inflammatory response is primarily triggered by tissue injury, not specifically microbial infection or erythrocyte migration, though infection can lead to injury.
Question 4 of 5
Bacterial infections can cause a serious, potentially fatal systemic inflammatory response called
Correct Answer: C
Rationale: Septic shock is a systemic inflammatory response to bacterial infection, potentially fatal, unlike anaphylaxis (allergic), pelvic disease (local), or pneumonia (lung-specific).
Question 5 of 5
When an antigen-presenting cell interacts successfully with a helper T cell, the antigen-presenting cell secretes a signal molecule that assists in the activation of the helper T cell. This signal molecule is
Correct Answer: C
Rationale: Interleukin-1 from antigen-presenting cells (e.g., macrophages) activates helper T cells, unlike interferon, complement, or perforin (cytotoxic T cell product).