AP BIOLOGY

Detailed explanation-1: -It shows electrons provided by succinate traveling first to FAD and then along a series of iron sulfur clusters to a ubiquinone acceptor. Complex II, like Complex I, is an entry point into the electron transport chain. In Complex II, two electrons are delivered from succinate.

Detailed explanation-2: -Complex II Other electron donors (e.g., fatty acids and glycerol 3-phosphate) also direct electrons into Q (via FAD). Complex II is a parallel electron transport pathway to complex 1, but unlike Complex I, no protons are transported to the intermembrane space in this pathway.

Detailed explanation-3: -NADH and FADH2 are essential to the function of the electron transport chain as electron donors, and are produced during glycolysis and the Krebs cycle to facilitate this process.

Detailed explanation-4: -FADH2 in the matrix deposits electrons at Complex II, turning into FAD and releasing 2 H+. The electrons from Complexes I and II are passed to the small mobile carrier Q. Q transports the electrons to Complex III, which then passes them to Cytochrome C.

Detailed explanation-5: -Answer and Explanation: After receiving the electrons and being reduced, NADH and FADH2 donate their electrons into the electron transport chain in the inner mitochondrial membrane.