What molecule is found at C?
CP
DPG
PEP
CAMP
The Correct Answer is D
A. CP: Creatine phosphate (phosphocreatine) is an energy-reserve molecule in muscle that donates phosphate to ADP to regenerate ATP; it is not a second messenger in hormone signal transduction and would not appear as the intracellular signaling oval shown.
B. DPG: 2,3-diphosphoglycerate (2,3-DPG) is an RBC metabolite that modulates hemoglobin’s O₂ affinity; it is not produced as a cytoplasmic second messenger following receptor activation.
C. PEP: Phosphoenolpyruvate (PEP) is a glycolytic intermediate involved in metabolism, not a hormone-activated intracellular signaling molecule.
D. CAMP: Cyclic AMP (cAMP) is a common second messenger produced by adenylate cyclase after many peptide hormones bind cell-surface receptors; the diagram’s small oval (C) inside the cytoplasm leading to downstream effects (D) fits cAMP.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Platelets: Both serum and plasma lack platelets because platelets are cellular elements that are removed during processing.
B. Fibrinogen: Plasma contains fibrinogen (clotting factor), but during clotting fibrinogen is converted to fibrin and removed, leaving serum free of fibrinogen.
C. Glucose: Glucose is present in both plasma and serum.
D. Albumin: Albumin, the main plasma protein, is present in both plasma and serum.
E. Nitrogenous wastes: Both plasma and serum contain nitrogenous wastes (like urea, creatinine).
Correct Answer is E
Explanation
A. 1: a single heme would carry one o₂, but adult hemoglobin contains more than one heme.
B. 0: hemoglobin contains heme groups (so zero is wrong).
C. 2: fetal hemoglobin and variants still have four heme groups per tetramer; two is not correct for a full hemoglobin molecule.
D. 3: hemoglobin has four globin chains and thus four heme groups, not three.
E. 4: each hemoglobin molecule has four heme groups (one per globin chain), so it can bind up to four o₂ molecules.
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