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AP Biology 2.5 A Describe the Mechanisms That Organisms Use to Maintain Solute and Water Balance Questions

Practise AP Biology 2.5.A questions by distinguishing passive from active transport and linking ion movement, water balance and transport-rate data to cell function.

Syllabus
Effective Fall 2025
Course
AP Biology

Exam points

  • distinguish passive diffusion from ATP-dependent movement against a concentration gradient
  • connect CFTR chloride transport to sodium, water balance and mucus hydration
  • calculate or compare membrane-transport rates from concentration and temperature data

AP Biology 2.5 A Describe the Mechanisms That Organisms Use to Maintain Solute and Water Balance Questions question 1

[Maximum number: 1]

To investigate whether red blood cells of animals lose the ability to take in glucose from their environment as they age, scientists collected red blood cells from guinea pigs that ranged in age from one day old to seven months old. Scientists incubated an equal number of red blood cells in separate culture dishes that contained a 300 nM solution of radioactively labeled glucose. The amount of radioactively labeled glucose present inside the red blood cells of each group was measured over time.

Describe a difference between passive transport and active transport.

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