Final answer:
The normalized oxygen consumption rate for the mouse in the metabolic chamber is 3.75 mL O₂/g body mass/hr.
Step-by-step explanation:
The question asks about the normalized oxygen consumption rate of a mouse placed in a metabolic chamber. If the soap bubble moved 5 mL in 4 minutes for a 20g mouse, we first need to normalize this value for both time (to an hour) and weight (per gram of body mass).
To calculate the oxygen consumption rate per hour, we convert the 4 minutes to hours (4 minutes is 1/15th of an hour) and then multiply the volume of O₂ by this factor: 5 mL × (60 minutes / 4 minutes) = 75 mL/hr. Next, to find the consumption rate per gram of body mass, we divide by the mouse's weight: 75 mL/hr ÷ 20g = 3.75 mL O₂/g body mass/hr.