concept 9.3: after pyruvate is oxidized, the citric acid cycle completes the energy yielding oxidation of organic molecules

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23 Terms

1
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what happens to most of the energy in glucose

most of the energy in glucose remains stored in the two pyruvate molecules produced by glycolysis

2
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where does pyruvate go in a eukaryotic cell go if O2 is present

enters the mitochondrion to complete glucose oxidation

3
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where does pyruvate go in a eukaryotic cell go if O2 is NOT present

goes to the cytosol

4
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what must happen before the citric acid begins

a pyruvate must be converted to acetyl coenzyme A (acetyl CoA)

5
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where does the citric acid cycle occur

occurs in the mitochondria

6
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does the citric acid cycle require O2

the citric acid cycle does require O2

7
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how is acetyl CoA produced

needs one pyruvate molecule and makes NADH+, H+, and CO2

8
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what does pyruvate dehydrogenase do

it catalyzes three reactions

9
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what does the oxidation of pyruvates carboxyl group do

releases the first CO2 of cellular respiration

10
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is any ATP generated during the process of pyruvate dehydrogenase catalyzing

no ATP is generated at all

11
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what happens first in the mitochondria before the citric acid cycle begins

Pyruvate is transported to the mitochondrial matric before it is converted to acetyl CoA

12
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other name for the citric acid cycle

the triboxylic acid cycle (TCA) or Krebs cycle

13
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where does the citric acid cycle take place

in the mitochondrial matrix

14
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what does the citric acid cycle oxidize

it oxidizes organic fuel derived from one molecule of pyruvate

15
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the citric acid cycle oxidizing organic fuel generates what

1 ATP, 3 NADH, and ! FADH2

16
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what does the partial oxidation of organic fuel do

breaks C-C bonds and releases CO2

17
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what happens to the electrons from the oxidation of pyruvic acid

the electrons are added to NAD+ and Fad (an electron carrier) to produce NADH and FADH2

18
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where does the 1 ATP come from in the citric acid cycle

is assembled from ADP + PO4 through substrate level phosphorylation using the energy from oxidation

19
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what are the products of the citric acid cycle

2 ATP, 6 NADH+ 6 H+, 2 FADH2, 4 CO2

20
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what is FAD

an electron carrier that becomes reduced when it accepts electrons to become FADH2

21
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what is the first step of the citric acid cycle

the acetyls group of acetyl acid joins the cycle by comping with oxaloacetate forming citrate

22
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what are the following 7 steps of the citric acid cycle

the next 7 steps of the citric acid cycle are decomposing the citrate back to oxaloacetate which makes the process a cycle

23
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what does the NADH and FADH2 produced by the cycle do

they relay electrons to the electron transport chain