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In a biological system, what is the primary role of mitochondria?
Protein Synthesis
Energy Production (ATP)
Waste Disposal
DNA Replication
Energy Production (ATP)
Mitochondria are known as the 'powerhouse of the cell' because they are the primary sites of cellular respiration. They generate adenosine triphosphate (ATP), which acts as the universal energy currency for various biological activities.
Mitochondria are known as the 'powerhouse of the cell' because they are the primary sites of cellular respiration. They generate adenosine triphosphate (ATP), which acts as the universal energy currency for various biological activities.
Think of mitochondria as the power plant or electrical generator of a city; just as a plant converts fuel into electricity for homes, mitochondria convert nutrients into ATP for the cell's survival.
Mitochondria = Mighty Powerhouse
C6тАЛH12тАЛO6тАЛ+6O2тАЛтЖТ6CO2тАЛ+6H2тАЛO+ATP тАФ General equation for aerobic cellular respiration
Mitochondria facilitate aerobic respiration through the Krebs cycle (Citric Acid Cycle) and the Electron Transport Chain (ETC). During this process, glucose is oxidized in the presence of oxygen to produce ATP through oxidative phosphorylation across the inner mitochondrial membrane, which contains folds called cristae to increase surface area.
Mitochondria possess their own circular DNA and ribosomes, supporting the Endosymbiotic Theory.
The inner membrane is highly folded into cristae to maximize space for ATP synthesis.
ATP synthesis is driven by a proton gradient maintained by the Electron Transport Chain.
High efficiency in energy production compared to anaerobic pathways.
Regulates cell metabolism and calcium signaling.
Mitochondrial dysfunction is linked to various metabolic and neurodegenerative diseases.
Generates reactive oxygen species (ROS) as a byproduct.
Muscular contraction in cardiac and skeletal tissues.
Active transport processes across cell membranes.
Option A is performed by Ribosomes.
Option C (Waste Disposal) is primarily the function of Lysosomes.
Option D (DNA Replication) occurs in the Nucleus during the S-phase of the cell cycle.
B is correct тАФ Mitochondria are the sites where ATP is produced through cellular respiration.
In exams, remember that mitochondria are absent in mature mammalian red blood cells (RBCs), which rely solely on glycolysis for ATP.
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