Question

Which one of the following is true for last three steps of oxidative photophosphorylation given below.
$Q\to C\to a{a}_3\to O_2$

• A. $Q\to$ C is $H^{+}$ absorbing site
• B. $aa_{3}\rightarrow O_{2} is H^{+}$ yielding site
• C. $Q\to$ C is $H^{+}$ yielding site and $a{a}_3\to O_2$ is $H^{+}$ absorbing site
• D. No $H^{+}$ is absorbed or released

Answer 1

Answer: (C)

$Q\to$ C is $H^{+}$ yielding site and $a{a}_3\to O_2$ is $H^{+}$ absorbing site

Oxidative phosphorylation is the metabolic pathway in which the mitochondria in cells use their structure, enzymes and energy released by the oxidation of nutrients to reform ATP. Although the many forms of life on earth use a range of different nutrients, ATP is the molecule that supplies energy to metabolism. Almost all aerobic organisms carry out oxidative phosphorylation.
Q --> C is H+ yielding site and aa${}_3$O${}_2$ is H+ absorbing site.