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BIOL 1000 Lecture Notes - Lecture 16: Succinyl-Coa, Acetyl-Coa, Pyruvate Dehydrogenase

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School
York University
Department
Biology
Course
BIOL 1000
Professor
Paula Wilson

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Document Summary

Lecture 16, pyruvate oxidation & krebs cycle in the investment stage you give glucose 2 atp. What you get out of it is 4 atp, 2 pyruvate & 2 nadh: in glycolysis you don"t lose any carbons, there is however a change in potential energy. Pyruvate oxidation (takes place inside the matrix: 2 pyruvate turn into acetyl - coa, 2 nadh are produced (1 for each pyruvate molecule, 2 co2 are released (1 for each pyruvate molecule) It is a complex because there are 3 proteins coming together. Decarboxilation: means that you are removing a carboxyl group, which is why we can go from 3-carbon pyruvate to 2-carbon acetyl-coa and release co2. There are 8 major catalyzed reactions in the krebs cycle. Citric acid cycle always begins with oxaloacetate (4 carbon molecule). Acetyl-coa interacts with oxaloacetate, giving you a 6 carbon molecule (citrate). An isomerase enzyme will change citrate into isocitrate. The rst nadh & co2 are created when.

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Related Questions

Which of the following is not a net product of the citric acid cycle for each molecule of pyruvate generated in glycolysis?

Select one:

a. 1 ATP (GTP)

b. 1 acetyl coA

c. 3 NADH

d. 1 FADH2

Question 2

Which of the following is NOT an end product for an acetyl group that enters the citric acid cycle?

Select one:

a. ATP

b. NADH

c. FADH2

d. oxaloacetate

Question 3

Once they have been processed through the citric acid cycle, the acetyl-CoA molecules from a single glucose molecule produce:

Select one:

a. 2 ATP, 6 NADH, 4 CO2.

b. 6 NADH, 6 GTP.

c. 6 FADH2, 2 ATP, 6 CO2.

d. 6 GTP, 6 FADH2.

e. 4 CO2, 6 FADH2, 2 ATP.

Question 4

The products of the citric acid cycle breaking down 2 acetyl-CoA include 2 ATP (converted from GTP), 6 NADH and 2 FADH2.

Select one:

True

False

35. During the complete catabolism of glucose, CO2 is released during ____ (note: Krebs cycle = citric acid cycle)
A. glycolysis only
B. Krebs cycle only
C. Krebs cycle and oxidation of pyruvate
D. oxidation of pyruvate only
E. Krebs cycle, glycolysis and oxidation of pyruvate

36. A reaction center, a primary electron acceptor and many chlorophyll molecules are all components of a/an _________ .
A. fluorescence center
B. photosystem
C. electron transport chain
D. carbon-fixation unit
E. electromagnetic spectrum

37. Which of the following generates the most reducing power?
A. anabolism of isoleucine
B. Calvin cycle
C. glycolysis
D. citric acid cycle
E. Hobbes reactions

38. After completion of the citric acid cycle (Krebs cycle), most of the usable energy from the original glucose molecule is in the form of _____.

A. acetyl CoA
B. ATP
C. NADH
D. CO2
E. FADH2

39. The light reactions of photosynthesis occur in:
A. all membranes of the chloroplast
B. the stroma
C. the matrix
D. the tonoplast membrane
E. thylakoid membranes

40. When chloroplasts are illuminated with white light, chlorophyll primarily absorbs:
A. photons of all wavelengths
B. green light only
C. red light only
D. blue light only
E. red and blue light

The complete conversion of a molecule glucose to six molecules of carbon dioxide via glycolysis and the Krebs cycle requires 19 reactions. Put the reactions that are given below in the proper order, beginning with the phosphorylation of glucose to form glucose-6-phosphate and ending with the oxidation of malate to form oxaloacetic acid.

1) 1,3-bisphosphoglycerate + ADP --> 3-phosphoglycerate + ATP
2) fumarate + H2O --> malate
3) isocitrate + NAD+ --> alpha-ketoglutarate + NADH + H+ + CO2
4) phosphoenol pyruvate + ADP --> pyruvate + ATP
5) Succinyl-CoA + GDP + Pi --> succinate + GTP + CoASH
6) glyceraldehyde 3-phosphate + NAD+ + Pi --> 1,3-bisphosphoglycerate + NADH + H+

Thank you for the help!