Topic 8.2 Cell Respiration (AHL)

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Across
  1. 1. carriers NAD and FAD coenzymes that carry H+ and e- to the electron transport chain (8, 8)
  2. 3. anaerobic stage of cellular respiration, in which citrate is oxidised by dehydrogenation resulting in reduced hydrogen carriers and carbon dioxide production for a small gain in ATP (5, 5)
  3. 7. OAA - a four-carbon (4C) molecule that binds with the two-carbon acetyl unit of acetyl-CoA to form citric acid (citrate) in the first step of the Krebs cycle. (12)
  4. 9. Type of chemical reaction where electrons are lost from a substance (9)
  5. 11. The metabolic process of adding a phosphate group onto an organic molecule resulting in a higher energetic state. (15)
  6. 18. ______________ space Low volume space between the inner and outer mitochondrial membranes. (5-8)
  7. 19. A chemical reaction where electrons are gained by a substance (9)
  8. 20. _________ group A two-carbon group (-COCH3) made by decarboxylation of pyruvate by oxidation (6)
  9. 21. Anaerobic first step in respiration, in which a molecule of glucose is broken into two molecules of pyruvate in the cytoplasm (10)
Down
  1. 2. The loss of a carboxyl group from an organic molecule as carbon dioxide (15)
  2. 4. Proteins arranged in chains on a membrane which transfer high energy electrons to a lower energy state (8, 8)
  3. 5. a small molecule (not a protein but sometimes a vitamin) essential for the activity of some enzymes (2-6)
  4. 6. ____________ phosphorylation Process in which ATP is formed (by the phosphorylation of ADP) as a result of the transfer of electrons from NADH or FADH2 to O2 by a series of electron carriers.
  5. 8. Complex of membrane bound proteins in the inner membrane of mitochondrion which has a proton channel and an enzyme which phosphorylates ADP generating ATP (3, 8)
  6. 10. Process by which H+ passively flows from inter-membrane to matrix through ATP synthase which leads to the creation of ATP (12)
  7. 12. The difference in hydrogen ion concentration on either side of a membrane - e.g. the inner membrane of the mitochondrion (6, 8)
  8. 13. tomography A technique where 3D models of structures are built using Transmission Electron Microscopy data. Can look at objects in 3D and see objects relative to one another. (7, 10)
  9. 14. a decarboxylation reaction that occurs in the mitochondrion between glycolysis and the Krebs cycle (4, 8)
  10. 15. A six carbon molecule formed in the Krebs cycle by the joining of an group from Acetyl CoA with an oxaloacetate (7)
  11. 16. ____________ electron acceptor Role of oxygen in aerobic respiration
  12. 17. In-foldings of the inner membrane of a mitochondrion that houses the electron transport chain proteins and ATP synthase (7)
  13. 20. The molecule which brings the 2C acetyl group into the matrix of the mitochondrion (6, 3)