ATI RN
Lymphatic System Review Questions Questions
Question 1 of 5
The integrin LFA-1 is constitutively expressed on the surface of resting T cells. Yet, integrin-dependent T cell adhesion to antigen-presenting cells increases substantially following TCR stimulation. This increased integrin-dependent adhesion is mediated in part by:
Correct Answer: C
Rationale: TCR signaling shifts LFA-1 to high affinity ; not synthesis , transport , or just phosphorylation .
Question 2 of 5
Which of the following statements about antibodies is false?
Correct Answer: D
Rationale: Mammalian antibodies have five classes (IgM, IgG, IgA, IgE, IgD), not two, making D false; others are true.
Question 3 of 5
Which of the following statements is true for antimicrobial peptides (AMPs)?
Correct Answer: C
Rationale: AMPs primarily perforate bacterial membranes to cause lysis, targeting prokaryotes, not enhancing phagocytosis or binding eukaryotic membranes.
Question 4 of 5
Complete this sentence. Major histocompatability complex type I (MHC)
Correct Answer: B
Rationale: MHC1 is on all nucleated cells, presenting processed peptides (8-10 aa) to CD8+ T cells, not CD4+.
Question 5 of 5
During negative selection, a strong interaction between an immature T cell receptor and self-peptide:
Correct Answer: D
Rationale: Strong binding triggers apoptosis to eliminate autoreactive T cells, not rescue or migration.