[Campbell Biology P.790] Based on the 'MAKE CONNECTIONS' section and general biological know... | Practice Question

Based on the 'MAKE CONNECTIONS' section and general biological knowledge, how do catabolic pathways contribute to a kangaroo rat's water supply in an arid environment?

  • A: Catabolic pathways break down complex molecules, producing water as a byproduct.
  • B: Catabolic pathways directly extract water from the dry air.
  • C: Catabolic pathways stimulate the kangaroo rat to seek out and consume more water-rich food.
  • D: Catabolic pathways convert absorbed sunlight into liquid water.

Explanation

Catabolic pathways, such as cellular respiration, break down complex organic molecules like carbohydrates, fats, and proteins to release energy. A byproduct of these reactions, particularly in the electron transport chain of cellular respiration, is metabolic water. This process is crucial for animals in arid environments, as it provides a significant source of water internally without needing to consume liquid water.