Biology 1002B Lecture Notes - Lecture 11: Intermembrane Space, Dinitrophenol, Pyruvate Dehydrogenase Kinase

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scarletrabbit663

24 Aug 2013

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The mitochondrion is an energy-transducing organelle, much like the chloroplast. The mitochondrial matrix is an aqueous environment, much like the stroma. Respiratory electron transport occurs within the inner mitochondrial membrane. Along the inner mitochondrial membrane, major proteins known as supramolecular complexes give rise to the transport of electrons. They consist of nadh dehydrogenase (enzyme complex), cytochrome complex (similar to cytochrome along thylakoid membrane), and cytochrome oxidase. It is important to note that these mitochondrial components are not specific to eukaryotes as bacteria have been known to contain them as well. Nadh dehydrogenase oxidizing nadh signals the beginning of respiratory electron transport. Then the ubiquinone region shuttles electrons from nadh dehydrogenase to the cytochrome complex. Once electrons exit the cytochrome complex they are paired with h+ ions and oxygen in the mitochondrial matrix, producing water (h2o). The production of water greatly distinguishes respiratory form photosynthetic electron transport as water is a reactant in the thylakoid reactions.

Related Questions

19. Which of the following is a component of Succinate dehydrogenase in Electron transport chain?

A. Niacin

B. FMN

C. FAD

D. Coenzyme Q

E. Lipoic acid

20. In electron transport the flow of electrons:

A. is bidirectional

B. goes from a high energy state to a low energy state

C. takes place in the outer mitochondrial membrane

D. are used to pump H+ into the mitochondrial matrix

21. Which of the following statements about the electron transport chain is NOT correct

A. It is located in the inner mitochondrion membrane

B. Cytochrome c accepts electrons from complex II

C. Cytochrome c oxidase (complex IV) accepts electrons from Cytochrome c

D. Complex I is called NADH dehydrogenase

E. Coenzyme Q accepts electrons from complex I and complex II

22. In the electron transport chain, the enzyme cytochrome C oxidase:

A. Uses H2O as a substrate

B. Produces HOOH as a product

C. Cannot function if oxygen is absent

D. Accepts electrons from hydrogen ions

E. Uses ADP and Pi as substrates

1. During the TCA cycle, four reactions occur in which a pair of electrons are transferred from a substrate to an electron accepting coenzyme. These reactions are catalyzed by?

2.During the TCA cycle, four reactions occur in which a pair of electrons are transferred from a substrate to an electron accepting coenzyme. These reactions are catalyzed by?

3.Potent respiratory poison, including carbon monoxide, azide and cyanide have their toxic effect by binding to the heme a3 site of _____.

4.The first step in the TCA cycle is the condensation of the two-carbon acetyl group with a four-carbon _____ to form a six-carbon citrate molecule?

5.The inner mitochondrial membrane is virtually devoid of ____, and and rich in ____, which are characteristics of bacterial plasma membranes.

6.Iron sulfur centers are joined to the protein by linkage to a sulfur atom of a/n ___.

7.Decarboxylation of pyruvate and transfer of the acetyl group to CoA , along with the reduction of NAD₊ is catalyzed by ___.

8.When FADH₂ is the electron donor, electrons are passed directly to ____ in the respiratory chain

9.With the exception of ____, all of the redox centers within the respiratory chain that accept and donate electrons are prosthetic groups.

10.It iis evident fromt eh net equation fo the TCA cycle that the primary products of the pathway are the reduced coenzymes _____.

11. Complex III catalyzes the transfer of electrons from ___ to ___.

12. The passage of a pair of electrons from NADH to ubiquinone in the respiratory chain is accompanied by movement of roughly four protons from (the) ___ to (the) ___.

13. When NADH is the electron donor, electrons pass the respiratory chain by means of ____.

14. The matrix of the mitochondrion has a gel-like consistency owing to the presence of a high conentration of _____.

These are questions I missed on a quiz the instructor does not post what the answers should be and has not responded to my emails please help.

Thanks,

Amber

Biology 1002B Lecture Notes - Lecture 11: Intermembrane Space, Dinitrophenol, Pyruvate Dehydrogenase Kinase

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