Question

which model best represents cellular respiration in animals? a. sugars, oxygen → cellular respiration → carbon dioxide, usable energy, heat, water b. usable energy, heat, carbon dioxide → cellular respiration → sugars, water, oxygen c. usable energy, oxygen, carbon dioxide → cellular respiration → sugars, water, heat d. sugars, heat → cellular respiration → water, oxygen, usable energy, carbon dioxide

Explanation:

Step1: Recall Cellular Respiration Inputs/Outputs

Cellular respiration in animals uses glucose (sugars) and oxygen as inputs. The outputs are carbon dioxide, water, usable energy (ATP), and heat.

Step2: Analyze Each Option

• Option A: Inputs are sugars and oxygen (correct inputs). Outputs: carbon dioxide, usable energy, heat, water (matches outputs of cellular respiration).
• Option B: Inputs include carbon dioxide (incorrect, carbon dioxide is an output), so eliminate.
• Option C: Inputs include carbon dioxide (incorrect) and outputs include sugars (incorrect, sugars are inputs), eliminate.
• Option D: Inputs are sugars and heat (heat is an output, not input), eliminate.

Answer:

A. Sugars and Oxygen as inputs to Cellular Respiration, with outputs Carbon Dioxide, Usable Energy, Heat, Water