Which of the following statements about Complex II of the respiratory chain is accurate?Group of answer choicesComplex II pumps 4 H+ into the intermembrane space for every 4 e- that pass throughComplex II passes electrons to Complex IIIComplex II receives electrons from NADHComplex II is an enzyme that catalyzes a reaction in the citric acid cycle.Two or more of the above are true
Question
Which of the following statements about Complex II of the respiratory chain is accurate?Group of answer choicesComplex II pumps 4 H+ into the intermembrane space for every 4 e- that pass throughComplex II passes electrons to Complex IIIComplex II receives electrons from NADHComplex II is an enzyme that catalyzes a reaction in the citric acid cycle.Two or more of the above are true
Solution
Para responder a la pregunta, vamos a analizar cada una de las afirmaciones sobre el Complejo II de la cadena respiratoria:
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"Complex II pumps 4 H+ into the intermembrane space for every 4 e- that pass through":
- Esta afirmación es incorrecta. El Complejo II no bombea protones (H+) al espacio intermembrana. A diferencia de los Complejos I, III y IV, el Complejo II no contribuye directamente al gradiente de protones.
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"Complex II passes electrons to Complex III":
- Esta afirmación es correcta. El Complejo II transfiere electrones a la ubiquinona (coenzima Q), que luego los lleva al Complejo III.
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"Complex II receives electrons from NADH":
- Esta afirmación es incorrecta. El Complejo II recibe electrones del succinato a través de la reacción catalizada por la succinato deshidrogenasa, no del NADH. El NADH transfiere sus electrones al Complejo I.
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"Complex II is an enzyme that catalyzes a reaction in the citric acid cycle":
- Esta afirmación es correcta. El Complejo II es también conocido como succinato deshidrogenasa, una enzima que cataliza la oxidación del succinato a fumarato en el ciclo del ácido cítrico.
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"Two or more of the above are true":
- Esta afirmación es correcta, ya que dos de las afirmaciones anteriores (la 2 y la 4) son verdaderas.
Por lo tanto, la respuesta correcta es: "Two or more of the above are true".
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