ATP Yield in Aerobic Respiration — NEET Biology
📚 Practice ConceptBut this kind of assumptions are not really valid in a living system; all pathways work simultaneously and do not take place one after another; substrates enter the pathways and are withdrawn from it as and when necessary; ATP is utilised as and when needed; enzymatic rates are controlled by multiple means. Yet, it is useful to do this exercise to appreciate the beauty and efficiency of the living system in extraction and storing energy. Hence, there can be a net gain of 38 ATP molecules during aerobic respiration of one molecule of glucose.
Which of the following statements accurately describe the dynamic nature and regulation of the respiratory pathway in living cells? S1: Respiratory intermediates cannot be withdrawn from the pathway as this would halt energy production. S2: Substrates like carbohydrates, fats, and proteins must strictly enter the respiratory pathway at its initial step to ensure orderly energy extraction. S3: The respiratory pathway is considered amphibolic because its intermediates can be diverted for the synthesis of other necessary compounds, making it both catabolic and anabolic. S4: In a living system, all metabolic pathways, including respiration, work simultaneously and substrates can be withdrawn or enter the pathways as and when needed. S5: Enzymatic rates within the respiratory pathway are controlled by multiple means, contributing to its flexibility and responsiveness to cellular needs.
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