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 A
Explanation
True: O₂ binds to the heme (iron) portion of hemoglobin, whereas CO₂ binds primarily to amino groups on the globin (forming carbaminohemoglobin) and much CO₂ is also converted to bicarbonate inside RBCs, so they bind/are carried at different sites/forms.
Correct Answer is {"dropdown-group-1":"A"}
Explanation
A. Melatonin: Secreted by the pineal gland, melatonin regulates circadian rhythms and sleep-wake cycles.
B. Hepcidin: Hepcidin regulates iron metabolism, not circadian rhythm.
C. Inhibin: Inhibin regulates FSH secretion in the reproductive system.
D. Calcitonin: Calcitonin (thyroid hormone) lowers blood calcium levels; it has no role in circadian rhythm.
E. Melanin: Melanin is a pigment in skin/hair/eyes, not a hormone regulating circadian rhythm.
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