Question

Which of the following serve as sites where protons are pumped across the membrane in the mitochondrial ETC? (Select all that apply.) Group of answer choices

Complex I

Complex II

Complex III

Complex IV

Answer 1

Answer:

Complex I Complex III and Complex IV seves as site in mitochondria where proteins are pumped across membrane in mitochondrial ETC.

complex I (can pump 4H+ ions acrros ghe membrane)  Complex I is composed of flavin mononucleotide (FMN) and an enzyme containing iron-sulfur (Fe-S). FMN,

Complex III ( pumps 4H+) is composed of cytochrome b, another Fe-S protein, Rieske center (2Fe-2S center), and cytochrome c proteins; this complex is also called cytochrome oxidoreductase.

Complex IV (pumps 2H+) is composed of cytochrome proteins c, a, and a3.

Wrong amswer

Complex II do not pass protons across the membrane in mitochondrial ETC (this complex only bypass electrons to complex III)

Outer membrane Outer membrane 4 Outer membrane 4 HD HO Intermem- brane space brane Η Protein complex of electron carriers Mobile electron carriers 2011 ΑΤΡ synthase 03 Inner mito- chondrial membrane 220 0000000000 Yowwwwww 0000000000 Electron flow FADH, FAD NAD NADH (H2O Mito- chondrial matrix ADP + Pi. ATP 1. Redox of NADH+H+ at Complex I, electrons go to Complex I, four protons pumped from matrix to intermembrane space 2. Redox of FADH, at Complex II, Coenzyme Q picks up electrons (from Complex I and II) and transports to Complex III 3. Redox of Complex III, four protons pumped from matrix to intermembrane space, carrier C transports electrons to Complex IV 4. Redox of Complex IV, two protons pumped from matrix to intermembrane space, formation of H,0 (20% of water in body) 5. ATP Synthase action, pumps protons from intermembrane space to matrix, produces ATP from ADP + Pi + energy Scanned with CamScanner Scanned with CamScanner