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Cellular Respiration Breakdown Questions with 100% Actual correct answers | verified | latest update | Graded A+ | Already Passed | Complete Solution

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  • June 19, 2024
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Cellular Respiration Breakdown

✅
Glucose → ATP- Glycolysis
Pyruvate decarboxylation
TCA (Krebs cycle)
Electron transport chain

Glycolysis-✅Break down of glucose
Anaerobic (no O2)

1 glucose mol. (6 Carbons) → 2 pyruvate mols. (3 Carbons)
2 ATP input → 4 ATP output & 2 NADH = 2 net ATP mols. & 2 NADH

Occurs in cytosol (not in organelle)

Steps:
Hexokinase: phosphorylates glucose → Glucose-6-phosphate →
irreversible rxn

Phosphofructokinase (PFK): phosphorylates Glucose-6-phosphate →
Fructose-1,6-bisphosphate → rate limiting step

✅
Most oxidized form of Carbon- CO2
Waste product of cellular respiration (occurs via oxidation)

✅
Oxidation rxns- ADP + Pi → ATP (oxidized)
NAD+ + FAD+ → FADH2 + NADH (oxidized)

Mitochondria- ✅Double layered
Outer membrane

Intermembrane space: H+ build up

Matrix:

, Krebs cycle → produces ATP
β-oxidation to break down fatty acids

Inner membrane: many folds to ↑ surface area → ↑ electron transport
chain output

Pyruvate decarboxylation- ✅Occurs in mitochondrial matrix
Aerobic process

2 pyruvate molecules from glycolysis transported into matrix via
secondary active transport using protons (doesn’t directly use ATP)

1 Pyruvate + Coenzyme A → Acetyl CoA + 1 NADH + 1 CO2
Pyruvate decarboxylate complex (PDC) catalyzes rxn

How many CO2 and NADH yield from the breakdown of 1 glucose?- ✅2
CO2 + 2 NADH

TCA (Krebs cycle) / Citric Acid Cycle- ✅Occurs in mitochondrial matrix
Aerobic process

1 Acetal CoA + oxaloacetate → citrate
Citrate further oxidizes until oxaloacetate is formed and the cycle repeats

Full cycle yields: 3 NADH + 1 FADH2 + 1 GTP (ATP) + 2 CO2

Electron transport chain (ETC)- ✅Occurs in inner membrane / cristae
of mitochondria

Aerobic process

Removes e- from glucose, pyruvate and Acetyl CoA

Oxidative phosphorylation occurs here

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