Unit 2 FRQ (Intercellular Transport) Answers

AP Bio Free Response Question Answers for Intercellular Transport

👋 Welcome to the AP Bio Unit 2 FRQ (Intercellular Transport) Answers. Have your responses handy as you go through the rubrics to see how you did!

⏱ Remember, the AP Biology exam has 6 free-response questions, and you will be given 90 minutes to complete the FRQ section. (This means you should give yourself ~15 minutes to go through each practice FRQ.)

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Setup

Quality proteins are required for optimal health. In the healthcare and fitness industries, different protein powders are often used to meet nutritional standards or to maximize muscle growth and development. Protein powders may be manufactured from dairy or vegetable sources, including whey, casein, soy, and peas. The following table (Table 1) demonstrates five different types of protein powders, including a blend of all four.

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Questions with Answers & Rubric

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(a) Sodium and potassium ions are both necessary for life and constantly move across cellular membranes. Identify the transport method that both sodium and potassium use together to move across membranes. 

🏆 1pt: Identify - Sodium potassium pump

📄 Additional Resources: Facilitated Diffusion

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(b) A bulk amount of protein is created in a cell’s endomembrane system and needs to evacuate the cell. Explain the method the bulk substance should use to exit the cell. 

🏆 3pts: Explain - Exocytosis, or “to exit the cell,” is when a vacuole of substances or a group of substances presses against the cell membrane until it “bubbles out” like an extremity. Eventually, it pinches off into a vacuole that exits and travels extracellularly.

📄 Additional Resources: Membrane Transport

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(c) Human cells require multiple substances to pass in and out of their membranes regularly. Design an experiment to test which molecules, listed below, can pass through the membrane via simple diffusion.

1. Water

2. Glucose

3. Salt (Na+)

4. Carbon dioxide

🏆 6pts: Design an experiment - For full credit, list the following for the experiment:

• hypothesis
• independent variable
• dependent variable
• control
• data collection method
• statement of large sample size
• statement that experiment should be run multiple times

📄 Additional Resources: Facilitated Diffusion

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Next Steps

• 🧠 Want to continue reinforcing your knowledge of Unit 2? Check out Unit 2 Trivia, either as a document or as a game.
• ⏭ Ready to move on to the next topic? Take a look at the collection of Unit 3 resources.
• • 📚 Want to review multiple units? Check out all of the AP Bio FRQs.