7: Cellular Respiration

Question 1

Oxidation

Answer 1

the process of hydrogen atoms leaving a moleculel

Question 2

Glucose breakdown: step 1

Answer 2

Glycolysis

• occurs outside mitchondria
• breakdown of glucose into 2 pyruvate
• glucose activated, 2 ATP gained
• results in NADH

Question 3

Glucose breakdown: step 2

Answer 3

Prep Reaction

• in matrix of mitchondria
• pyruvate broken dwn into 2-carbon acetyl carried by coenzyme A (CoA)
• Oxidation of pyruvate results in NADH + CO2

Question 4

Glucose breakdown: step 3

Answer 4

Citric Acid Cycle

• in matrix of mitochondria
• oxidation occurs
• NADH + FADH2 results
• more CO2 released
• produces 2 ATP

Question 5

Glucose breakdown: step 4

Answer 5

Electron Transport Chain

• electron carriers in the cristae of mitochondria
• NADH + FADH2 give up electrons to chain
• electrns move from higher to lower energy
• O2: final electron acceptor
• combines with H+ to produce H2O

Question 6

Alternate metabolic pathways in food

Answer 6

1. Proteins
2. Carbs
3. Fats and Oils

Question 7

when does Fermentation occur?

Answer 7

when oxygen isn’t available and complete breakdown of glucose isn’t possible

Question 8

What is Fermentation?

Answer 8

anaerobic breakdown of glucose

Question 8

How does Fermentation occur?

Answer 8

• pyruvate formed by glycolysis accepts 2 H+ atoms
• reduced to lactate
• reaction regenerates NAD+ which picks up more electrons

Question 9

What does Fermentation produce?

Answer 9

• 2 ATP per glucose
• rapid burst of energy

Question 10

Microorganisms using fermentation

Answer 10

• in order to produce organic acid
• yeasts generate CO2 + ethyl alcohol to make bread rise
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