Why do memory cells play a key role in the immune response?
support the immune response by recognizing reoccurring antigens
change into an antibody-secreting cell once activated
bind complement to the antibody
immediately secreting antibodies following the first exposure
The Correct Answer is A
A. support the immune response by recognizing reoccurring antigens: Memory cells persist after an initial exposure and rapidly recognize and respond to repeat exposures, enabling a faster, stronger secondary response.
B. change into an antibody-secreting cell once activated: Memory B cells can rapidly differentiate into plasma (antibody-secreting) cells on re-exposure, but this is a consequence of their role rather than the defining reason they’re crucial.
C. bind complement to the antibody: Binding complement is a function of some antibodies (via the Fc region), not a function performed by memory cells themselves.
D. immediately secreting antibodies following the first exposure: Antibody secretion on first exposure is performed by activated naïve B cells/plasma cells; memory cells are formed after the first exposure and act on subsequent exposures.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is E
Explanation
A. Infection: Some infections (esp. urinary tract infections) can cause transient proteinuria, but infection is not the most specific cause.
B. Bleed: Bleeding (hematuria) shows blood in urine, not protein as the defining marker.
C. Diabetes: Diabetes (diabetic nephropathy) commonly causes persistent proteinuria, but proteinuria itself more directly indicates renal involvement.
D. Liver failure: Liver disease does not typically cause proteinuria as a primary finding.
E. Kidney disease: Protein in the urine (proteinuria) is most directly a sign of kidney dysfunction/glomerular damage (though causes include diabetes, hypertension, infection, etc.).
Correct Answer is B
Explanation
B. False: Edema in inflammation results from vasodilation and increased vascular permeability (plasma proteins and fluid leak into interstitium), not from vasoconstriction.
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