What is the primary function of mitochondria in eukaryotic cells?
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Mastering this deck will enhance your understanding of cellular energy production, enabling accurate diagnosis of mitochondrial disorders and effective management of metabolic diseases. It also provides a solid foundation for advanced study in biochemistry and clinical medicine related to energy metabolism.
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| # | Front | Back | Hint |
|---|---|---|---|
| 1 | What is the primary function of mitochondria in eukaryotic cells? |
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Details energy transfer in cells, mitochondrial structure, oxidative phosphorylation, and related metabolic diseases.
The primary function of mitochondria is to generate ATP through oxidative phosphorylation, providing energy for cellular processes. |
| Powerhouse of the cell |
| 2 | Describe the basic structure of a mitochondrion. | A mitochondrion has an outer membrane, an inner membrane folded into cristae, the intermembrane space, and the mitochondrial matrix where the Krebs cycle occurs. | Think of a double-layered energy factory |
| 3 | What are the main components of the electron transport chain (ETC)? | The main components include Complex I (NADH dehydrogenase), Complex II (succinate dehydrogenase), Complex III (cytochrome bc1 complex), Complex IV (cytochrome c oxidase), and ATP synthase. | ETC components are like stations in a relay race |
| 4 | Where in the mitochondrion does the Krebs cycle occur? | The Krebs cycle occurs in the mitochondrial matrix. | Think of the matrix as the engine room |
| 5 | What is the role of NADH and FADH2 in mitochondrial energy production? | NADH and FADH2 carry electrons to the electron transport chain, where their energy is used to produce ATP via oxidative phosphorylation. | Electron carriers in cellular respiration |
| 6 | Which enzyme catalyzes the synthesis of ATP in mitochondria? | ATP synthase (Complex V) catalyzes the conversion of ADP and inorganic phosphate into ATP during oxidative phosphorylation. | Known as the molecular turbine |
| 7 | Explain the proton motive force in mitochondria. | The proton motive force is the electrochemical gradient generated by the ETC, which drives ATP synthesis as protons flow back through ATP synthase. | Like water behind a dam powering turbines |
| 8 | What is the significance of mitochondrial DNA (mtDNA)? | mtDNA encodes essential proteins for oxidative phosphorylation; mutations can lead to mitochondrial diseases due to defective energy production. | Mitochondria have their own genetic blueprint |
| 9 | Name a common mitochondrial disorder caused by defects in oxidative phosphorylation. | Leber's Hereditary Optic Neuropathy (LHON) is a mitochondrial disorder caused by mutations affecting complex I, leading to vision loss. | Inherited optic nerve degeneration |
| 10 | What is the Warburg effect and its relevance to cancer? | The Warburg effect describes the preference of cancer cells to undergo glycolysis even in the presence of oxygen, leading to increased lactate production despite mitochondrial capacity for oxidative phosphorylation. | Cancer cells 'favor' glycolysis |
| 11 | How does uncoupling of oxidative phosphorylation affect ATP production? | Uncoupling dissipates the proton gradient as heat without producing ATP, reducing efficiency of energy generation. | Think of a leak in the energy engine |
| 12 | Which enzyme is involved in mitochondrial fatty acid ฮฒ-oxidation? | Acyl-CoA dehydrogenase catalyzes the initial step of fatty acid ฮฒ-oxidation within mitochondria. | Breaks down fats for energy |
| 13 | What is mitochondrial myopathy? | Mitochondrial myopathy is a disorder characterized by defective mitochondrial function leading to muscle weakness and exercise intolerance. | Muscle energy deficiency |
| 14 | Name a clinical feature associated with mitochondrial diseases. | Features include muscle weakness, neurodegeneration, lactic acidosis, and multisystem involvement. | Think of widespread energy failure |
| 15 | How does mitochondrial dysfunction contribute to neurodegenerative diseases? | Impaired mitochondrial function leads to decreased energy supply and increased oxidative stress, contributing to neuronal death in diseases like Parkinsonโs and Alzheimerโs. | Neurons are highly energy-dependent |
| 16 | What is the role of cytochrome c in mitochondria? | Cytochrome c transfers electrons between Complex III and Complex IV in the electron transport chain and can trigger apoptosis when released into the cytoplasm. | Bridge in the ETC and apoptosis signal |
| 17 | Define oxidative phosphorylation. | Oxidative phosphorylation is the process by which ATP is formed as electrons are transferred through the ETC, coupled with proton pumping and ATP synthase activity. | Main ATP-generating process in mitochondria |
| 18 | What is the clinical significance of mitochondrial DNA mutations? | They can cause mitochondrial diseases with varied symptoms, often affecting tissues with high energy demands like brain, muscle, and heart. | Mutations in mitochondrial blueprint |
| 19 | Describe how mitochondrial dysfunction can lead to lactic acidosis. | Impaired oxidative phosphorylation forces cells to rely on anaerobic glycolysis, increasing lactate production and causing lactic acidosis. | Anaerobic metabolism increases lactate |
| 20 | What is the Pasteur effect? | The reduction in glycolysis rate when oxygen is abundant due to increased reliance on mitochondrial oxidative phosphorylation. | Switch from fermentation to respiration |
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