If you were to compare an obese and a normal sized rat, you would conclude that:

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Question restatement: The prompt asks us to compare an obese rat with a normal-sized rat and draw a conclusion about their metabolic body weight (metabolic BW).
Option 1: 'The metabolisable energy requirement of the obese rat is higher than the normal rat.' This statement concerns the total energy needs (metabolizable energy requirement) rather than how those needs relate to body size. While a larger animal may require more energy in absolute terms, metabolic BW is a scaling concept that accounts for body size using BW^0.75. Therefore, saying the energy requirement is higher in absolute terms is not the same as stating how metabolic BW compares. It risks conflating absolute energy needs with size-adjusted metabolic scaling.
Option 2: 'Their metabolic BW are the same.' This would be true only if both animals had identical size or if metabolic BW scaled to be equal despite weight differences, which contradicts the principle that larger animals typically have higher metabolic BW due to scaling laws. Since an obese rat has greater body mass, their metabolic BW would not be equal to that of a normal-weight rat.
Option 3: 'The metabolic BW of the obese rat is higher than the normal rat.' This aligns with the idea that metabolic BW scales with body weight (often via BW^0.75 in many models). An obese rat, having greater body mass, would exhibit a higher metabolic BW, reflecting increased size and energy requirements when adjusted for body mass relationships.
Option 4: 'The metabolic BW of the obese rat is lower than the normal rat.' This is inconsistent with metabolic scaling principles: a larger animal would not typically have a lower metabolic BW since metabolic BW is tied to body size; a smaller, normal-weight rat would not have higher metabolic BW than a larger obese counterpart.
In summary, the core concept hinges on metabolic BW increasing with body mass as dictated by allometric scaling, making the obese rat have a higher metabolic BW than the normal rat, while the other options either misstate absolute energy needs, claim equality, or incorrectly state a decreased metabolic BW.

ANSC20002_2025_SM2 Mid Semester exam

If you were to compare an obese and a normal sized rat, you would conclude that:

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