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.
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? | 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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