Chapter 8 Metabolic Pathways Flashcards Preview

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Flashcards in Chapter 8 Metabolic Pathways Deck (10)
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1
Q

Cellular Respiration

A

process organisms undergo to convert glucose to energy

  • involves 4 stages:
    1. Glucose catabolism (usually glycolysis)
    2. Transition or Bridge Reaction
    3. Krebs Cycle
    4. Electron Transport
  • may occur aerobically (most efficient) or anaerobically
2
Q

Glycolysis

A

-Location: cytoplasm
-Oxygen Requirement: none
-Reactant: glucose
-By Products: NADH , ATP (4-2=2 net)
-Final Product: 2 pyruvates (C3)
(becomes the reactant of next step)

3
Q

Metabolic Pathway: Aerobic Respiration

A

C6H12O6 + 6O2–> 6 CO2 + 6H2O + ATP
-aerobic catabolism of nutrients to carbon dioxide, water, and energy, and involves an electron transport system in which molecular oxygen is the final electron acceptor

4
Q

Aerobic Respiration: Transition/ Bridge Reaction

A
2nd Stage
-Location: 
>Prokaryotic Cell: cytoplasm 
>Eukaryotic Cell: mitochondrial matrix 
-Reactant: Pyruvate (C3)
-Products: CO2 NADH
-Final Product: Acetyl CoA (C2) 
(product of step 2; reactant of step 3 in pathway)
5
Q

Aerobic Respiration: Krebs Cycle

A
3rd Stage
C2--> 0C
-Location: 
>Prokaryotic Cell: Cytoplasm 
>Eukaryotic Cell: Mitochondrial Matrix
-Reactant: Acetyl CoA (C2)
-Products: CO2 ATP
-Final Products: NADH FADH2
(product of step 3; reactant of step 4)
6
Q

Aerobic Respiration: Electron Transport

A
4th Stage
-Location: 
>Prokaryotic Cell: plasma membrane
>Eukaryotic Cell: mitochondrial inner membrane
-Reactant: NADH FADH2
-Products: ATP
-Final Product: H20
-Final Electron Acceptor: Oxygen
7
Q

Metabolic Pathway: Anaerobic Respiration

A

-Location:
>Prokaryotic: plasma membrane
>Eukaryotic: mitochondrial inner membrane
-Reactant: NADH FADH2
-Products: Less ATP
-Final Product: NO2, N2O, N2, H2S, CH4
-Final Electron Acceptor: Not Oxygen (inorganic oxygen containing molecules)

8
Q

Metabolic Pathway: Acid + Alcohol Fermentation

A
  • Species Specific
  • Heterolactic: yields carbon dioxide and ethanol in addition to lactic acid
  • Homolactic: one molecule of glucose is ultimately converted to two molecules of lactic acid
9
Q

Fermentation: Heterolactic

A

yields carbon dioxide and ethanol in addition to lactic acid

10
Q

Fermentation: Homolactic

A

one molecule of glucose is ultimately converted to two molecules of lactic acid