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A cell can carry out its constant and in...

A cell can carry out its constant and intensive metabolic activities with relatively small amounts of such vital components as `ATP, NAD^(+)` , coenzyme A, etc. because it can:

A

rapidly recycle these compounds

B

bypass reactions that require these compounds

C

incur an oxygen debt until these compounds become available

D

utilize substitute molecules in place of these compounds

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To answer the question, "A cell can carry out its constant and intensive metabolic activities with relatively small amounts of such vital components as ATP, NAD^(+), coenzyme A, etc. because it can:", we will break down the reasoning step by step. ### Step-by-Step Solution: 1. **Understanding the Components**: - ATP (adenosine triphosphate) is the energy currency of the cell. It provides energy for various cellular processes. - NAD^(+) (nicotinamide adenine dinucleotide) acts as an electron acceptor in metabolic reactions, particularly in glycolysis and the Krebs cycle. - Coenzyme A is involved in the formation of acetyl-CoA, which is crucial for the Krebs cycle. 2. **Recycling of ATP**: - ATP is utilized by breaking its phosphate bonds, releasing energy for cellular activities. - After its use, ATP is converted into ADP (adenosine diphosphate) and inorganic phosphate. - The cell can regenerate ATP from ADP and inorganic phosphate through processes such as glycolysis, the Krebs cycle, and oxidative phosphorylation. 3. **Recycling of NAD^(+)**: - NAD^(+) accepts electrons during metabolic reactions, particularly in glycolysis and the Krebs cycle. - Once it accepts electrons, it becomes NADH. This NADH can then donate electrons in the electron transport chain, regenerating NAD^(+) for further use in metabolic pathways. 4. **Recycling of Coenzyme A**: - Coenzyme A is used to form acetyl-CoA from pyruvate, which is derived from glycolysis. - After its use in the Krebs cycle, coenzyme A can be regenerated and reused in subsequent cycles of metabolism. 5. **Conclusion**: - The cell can carry out its metabolic activities efficiently with small amounts of these vital components because it can rapidly recycle ATP, NAD^(+), and coenzyme A through various metabolic pathways. This recycling allows the cell to maintain a steady supply of these essential molecules without needing to synthesize them in large quantities. ### Final Answer: A cell can carry out its constant and intensive metabolic activities with relatively small amounts of such vital components as ATP, NAD^(+), coenzyme A, etc., because it can rapidly recycle these compounds.
To answer the question, "A cell can carry out its constant and intensive metabolic activities with relatively small amounts of such vital components as ATP, NAD^(+), coenzyme A, etc. because it can:", we will break down the reasoning step by step. ### Step-by-Step Solution: 1. **Understanding the Components**: - ATP (adenosine triphosphate) is the energy currency of the cell. It provides energy for various cellular processes. - NAD^(+) (nicotinamide adenine dinucleotide) acts as an electron acceptor in metabolic reactions, particularly in glycolysis and the Krebs cycle. - Coenzyme A is involved in the formation of acetyl-CoA, which is crucial for the Krebs cycle. ...
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