27. Which of the following statements concerning hemoglobin is correct? (A) Oxygen binds to the porphyrin ligands of the heme groups. (B) Carbon monoxide is toxic because it degrades the heme groups in hemoglobin. (C) The four heme subunits of hemoglobin exhibit cooperativity in their binding of oxygen. (D) The binding of oxygen by hemoglobin is pH insensitive. (E) Hemoglobin binds O2 irreversibly.

27. Which of the following statements concerning hemoglobin is correct?
(A) Oxygen binds to the porphyrin ligands of the heme groups.
(B) Carbon monoxide is toxic because it degrades the heme groups in hemoglobin.
(C) The four heme subunits of hemoglobin exhibit cooperativity in their binding of oxygen.
(D) The binding of oxygen by hemoglobin is pH insensitive.
(E) Hemoglobin binds O2 irreversibly.

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統計： A(1), B(0), C(0), D(0), E(1) #3252569

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題目解析題目詢問有關血紅蛋白（hemo...

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4. A strip of copper is placed in a 1 M solution of copper nitrate, and a strip of silver is placed in a 1 M solution of silver nitrate. The two metal strips are connected to a voltmeter by wires, and a salt bridge connects the solutions. The following standard reduction potentials apply: Ag+(aq) + e- → Ag(s) E° = +0.80 V Cu2+(aq) + 2e- → Cu(s) E° = +0.34 V When the voltmeter is removed and the two electrodes are connected by a wire, which of the following does .not. take place? (A) Negative ions pass through the salt bridge from the silver half-cell to the copper half-cell. (B) Some positive copper ions pass through the salt bridge from the copper half-cell to the silver half-cell. (C) The silver electrode increases in mass as the cell operates. (D) Electrons flow in the external circuit from the copper electrode to the silver electrode. (E) There is a net general movement of silver ions through the salt bridge to the copper half-cell.

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