BIOL 112 Chapter Notes - Chapter 7.3, 7.4: Intermembrane Space, Inner Membrane, Pyruvic Acid

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copperswan658

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BIOL 112 Full Course Notes

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Pyruvate is oxidized in the mitochondrial matrix, forming acetyl-coa, the first substrate in the citric acid cycle. A key step that links glycolysis to the citric acid cycle. First process that takes place inside the mitochondria (matrix) A mitochondrion consists of an outer membrane, intermembrane space, inner membrane, and the matrix. Intermembrane space the space between the inner and outer membranes. Mitochondrial matrix the space enclosed by the inner membrane. Overall, the synthesis of one molecule of acetyl-coa from pyruvate results in the formation of one molecule of carbon dioxide and one molecule of nadh. Since a single molecule of glucose forms two molecules of pyruvate during glycolysis, pyruvate oxidation of both pyruvate molecules produces: Oxaloacetate is the starting and ending molecule of the cycle. Inputs and outputs of the cycle: two carbons are eliminated during the cycle, released as carbon dioxide (sources of the carbon dioxide that we exhale when we breathe)

Related Questions

Where does each of these processes take place within the cell? Possible answers: cytosol, mitochondrial matrix, lysosome, nucleus, inner mitochondrial membrane, outer mitochondrial membrane, mitochondrial intermembrane space

1. Glycolysis cytosol

2. citric acid cycle Mitochondrial Matrix

3. conversion of pyruvate to activated acetyl groups

4. oxidation of fatty acids to acetyl CoA

5. glycogen breakdown

6. release of fatty acids from triacylglycerols

7. oxidative phosphorylation

bronzeimpala88

1.) Certain complexes of the mitochondrial electron transport chain pump protons. Which of the following BEST describes the movement of protons in this situation?

a.) across the outer mitochondrial membrane, from the cytoplasm to the intermembrane space

b.) across the outer mitochondrial membrane, from the intermembrane space to the cytoplasm

c.) across the inner mitochondrial membrane, from the intermembrane space to the matrix

d.) across the inner mitochondrial membrane, from the matrix to the inter membrane space

2.) Which regulatory mechanism is activated when the overall energy availability of a cell is high?

a.) Citrate inhibits phosphofructokinase-1.

b.) ADP up-regulates phosphofructokinase-1.

c.) ATP inhibits phosphofructokinase-1.

d.) AMP up-regulates phosphofructokinase-1.

3.) Electron carriers are oxidized during which of the following reactions?

a.) glycolysis

b.) citric acid cycle

c.) electron transport chain

d.) the conversion of pyruvate to acetyl coA

e.) all of the above

purpleswan410

Select all of the following statements that are true concerning the citric acid cycle:

______________________

__	NAD+ an FAD become reduced.

__	High-energy carbon dioxide molecules will be generated by substrate-level phosphorylation.

__	ATP is synthesized by chemiosmosis.

__	The organic carbon (from acetyl CoA) that enters the cycle will be completely oxidized in the mitochondrial matrix.

__	Citrate must be continuously regenerated to prepare the cycle to process incoming acetyl CoA.

__	Upon entry into the citric acid cycle, acetyl CoA is combined with oxaloacetate.

__	Two ATP molecules will be consumed for each acetyl CoA that is processed by the cycle.

__	Organic molecules are oxidized in several different steps of the cycle.

BIOL 112 Chapter Notes - Chapter 7.3, 7.4: Intermembrane Space, Inner Membrane, Pyruvic Acid

BIOL 112 Full Course Notes

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