Which of the following proteins has largest capacity to bind with thyroxine?

Correct Answer: A

Rationale: Albumin has the largest capacity to bind thyroxine due to its high plasma concentration, though TBG has higher affinity. Transferrin and ferritin are involved in iron transport/storage, not thyroxine.

Correct Answer: B

Rationale: Aldosterone has minor glucocorticoid action but primarily regulates Na^+/K^+ via nuclear receptors, not G-proteins. It responds to hyperkalemia, causes acidic urine, and is protein-bound.

Correct Answer: A

Rationale: Chromium enhances insulin action; its deficiency leads to insulin resistance and glucose intolerance.

Correct Answer: B

Rationale: Colipase, secreted by the pancreas, activates pancreatic lipase by aiding fat digestion; cholera acts extracellularly, B_{12} uses intrinsic factor, and oxalates inhibit Ca2+ absorption.

Correct Answer: D

Rationale: ~9 L of fluid enters the gut daily: 2 L ingested, 7 L from secretions (saliva, gastric, pancreatic, etc.).