What is the target of cytotoxic T cells?
Antigens in solution
Cancer cells and virally infected cells
Antigen-presenting cells
Helper T cells
The Correct Answer is B
A. Antigens in solution: cytotoxic T cells (CD8⁺) recognize antigen presented on MHC I of cells, not free/soluble antigens in plasma.
B. Cancer cells and virally infected cells: cytotoxic T cells detect abnormal peptides on MHC I and kill virally infected or neoplastically transformed (cancer) host cells.
C. Antigen-presenting cells: Partially misleading -professional APCs present antigen on MHC II to helper T cells; cytotoxic T cells usually target infected or abnormal host cells (though APCs can present antigen on MHC I and theoretically be targeted).
D. Helper T cells: helper T cells (CD4⁺) are immune coordinators, not the usual targets of cytotoxic T cells.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is {"dropdown-group-1":"B","dropdown-group-2":"B"}
Explanation
A. Colony-stimulating factor; negative: colony-stimulating factors (CSFs) chiefly stimulate white blood cell production, not RBCs. The feedback characterization here is not applicable to erythropoiesis.
B. Erythropoietin; positive: erythropoietin (EPO) does stimulate RBC production, but the regulatory loop is negative feedback. So labeling it “positive” is wrong.
C. Erythropoietin; negative: EPO is the hormone that stimulates RBC production and it is regulated by a negative feedback mechanism based on tissue oxygenation.
D. Colony-stimulating factor; positive: CSFs affect leukocyte lines, and erythropoiesis is not regulated by a positive-CSF loop.
Correct Answer is A
Explanation
A. Radial artery on the wrist: Most commonly palpated peripheral pulse site.
B. Internal jugular vein in the neck: Venous pulsations are observed, not palpated as an arterial pulse.
C. Aorta in the chest: Not a routine palpable site.
D. Subclavian artery in the neck: Deep and not a common palpation site.
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