Question
What is the terminal electron acceptor in the human electron transport chain? a. Glucose b. O_2 c. CO_2 d. CO e. Fe^+3 What is the name of the process that results in the production of ATP as protons move through ATP synthase? a. Protonation b. Electrophoresis c. Glycolysis d. Substrate-level phosphorylation e. Oxidative phosphorylation Which is NOT a possible electron carrier? a. flavoproteins b. proteins containing cytochromes c. copper atom containing carriers d. ATP synthase e. iron-sulfur proteins Respiration captures 6-7% of the energy in glucose. a. True b. False Of the following, which one evolved first (or from an evolutionary perspective, the one that is the oldest)? a. ATP synthase b. The nucleus c. Mitochondria d. Substrate-level phosphorylation e. Photosynthesis in plants How is the transfer of electrons from NADH coupled to proton pumping (bacterial example): a. Bacteria do not have electron-transfer proteins: and therefore, do not pump protons. b. A system of alpha-helical, membrane proteins change their shape during electron energy transfer thus functioning as a piston to pump protons from the cytoplasm to the periplasmic space. c. A rotating y protein binds the electrons from NADH and functions as a pump. d. The adenine nucleotide translocator (Ant) is an antiporter and exchanges the electrons from NADH along with protons across the membrane. e. By interspecies electron transfer Consider ATP synthase, which one is FALSE a. Each beta unit (n = 3) contains a catalytic site which covalently attaches a phosphate group to ADP b. The c- and y-units rotate c. Found in all animal cells d. Found in all bacteria e. Actively pumps electrons against their concentration gradient during ATP production
Explanation / Answer
Question: 20. what is the terminal electron acceptor in the electron transport chain?
Answer: b) O2
The final acceptor of electrons in the electron transport chain during aerobic respiration is molecular oxygen.
