Question at position 36 1. Why are proteins not a good source of first energy? All of the AboveEnzymes and organelles essential to cellular life are made of proteinsMore complex steps in catabolismOne of the by-products, ammonium, is toxic to cells

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Question at position 36: Why are proteins not a good source of first energy? All of the AboveEnzymes and organelles essential to cellular life are made of proteinsMore complex steps in catabolismOne of the by-products, ammonium, is toxic to cells

Option 1: All of the Above. This choice asserts that every listed statement is true. Since the other options each make a claim, evaluating their accuracy helps determine if this composite statement can be true.

Option 2: Enzymes and organelles essential to cellular life are made of proteins. It is accurate that many enzymes are proteins and that essential cellular structures (to a large extent) are protein-based. However, in the context of energy sources, this statement alone does not directly explain why proteins are not a good first energy source, but it is factually correct about the composition of many critical proteins and organelles.

Option 3: More complex steps in catabolism. Proteins require more complex catabolic pathways to be broken down for energy, compared with carbohydrates or fats. This means they are less efficient as a quick energy source and involve more steps, making them a less favorable immediate energy source. This statement captures a valid aspect of protein metabolism related to energy use.

Option 4: One of the by-products, ammonium, is toxic to cells. When proteins are deaminated during energy extraction, ammonium can be produced, which is indeed toxic at high concentrations. This adds a drawback to using proteins as a rapid energy source.

Putting these together, options 2, 3, and 4 describe accurate aspects of protein metabolism and its drawbacks as an energy source. When considered collectively, they support the claim made by option 1 that All of the Above is true. The reasoning emphasizes that proteins are not typically the preferred immediate energy source due to the enzyme-rich nature of proteins, the multi-step catabolic processes required, and the potential toxicity from by-products like ammonium.

Question at position 36 1. Why are proteins not a good source of first energy? All of the AboveEnzymes and organelles essential to cellular life are made of proteinsMore complex steps in catabolismOne of the by-products, ammonium, is toxic to cells

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