What organelle synthesises most of the ATP used by cells?什么细胞器合成细胞使用的大部分 ATP？

Question

BlackTom AI · Accepted Answer

To evaluate which organelle synthesises most of the ATP used by cells, let's examine each option carefully.
Option a: Ribosomes. Ribosomes are the sites of protein synthesis, translating mRNA into polypeptides. They do not generate ATP themselves, so they do not contribute significantly to cellular ATP production. This makes them an unlikely source for the majority of ATP.
Option b: Mitochondria. Mitochondria are the powerhouses of the cell, where oxidative phosphorylation occurs during cellular respiration. The electron transport chain creates a proton gradient that drives the synthesis of ATP from adenosine diphosphate (ADP) and inorganic phosphate (Pi) via ATP synthase. This process accounts for the vast majority of ATP produced, especially under aerobic conditions.
Option c: Golgi apparatus. The Golgi apparatus functions in modifying, sorting, and shipping proteins and lipids to their destinations. It does not generate ATP; its roles are largely trafficking and processing, not energy production. Thus, it cannot be the main ATP source.
Option d: Lysosomes. Lysosomes are involved in macromolecule degradation and recycling within the cell, containing digestive enzymes. While they contribute to cellular turnover, they do not produce substantial ATP. Therefore, they are not the primary ATP source.
Option e: Endoplasmic reticulum. The endoplasmic reticulum (ER) is involved in protein and lipid synthesis and calcium storage. While metabolically active, ATP production occurs primarily in mitochondria, not the ER, so the ER is not the main contributor to ATP synthesis.
In summary, among the listed organelles, the one dedicated to generating most of the cell’s ATP through oxidative phosphorylation is the mitochondrion, aligning with its well-established role as the cellular energy factory.

What organelle synthesises most of the ATP used by cells?什么细胞器合成细胞使用的大部分 ATP？单项选择题

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