Name: _________________________________________________ Date: _______________ Period: ________ Biology Notes: Passive Transport Directions: Fill in as we cover the topic in the PowerPoint. Corresponds to pages 85 – 87 in your textbook. Passive Transport Additional Info
• Passive Transport: Cell spends _____energy _________to move molecules • Molecules move from a __________________________concentration – _______________their concentration gradient • Examples: – ______________________ – ______________________ – ______________________ diffusion Diffusion • Diffusion: __________________ of molecules from an area of __________ to ________ concentration • Movement _______________________until _______________________ is reached – Equilibrium: ______________ balance of molecules • This is how many molecules move ____________ and ____________ of cells Osmosis • Defined: Diffusion of _______________ from a high to low concentration • Distilled water – ________________________ H2O (no solutes) – __________________ environment • Salt water – __________ solutes (namely salt) – ___________________ environment Quick Lab Activity: Fill in the beakers as we discuss the slides. 1 Minute Discuss with Your Neighbor 1) Where is the high water concentration in the salt water experiment? ________________ 2) Low water concentration?________________ 3) Where is the high water concentration in the distilled water experiment?________________ 4) Low water concentration?________________ 30 Seconds Discuss with Your Neighbor 5) Why did the salt water potato lose weight?________________ 6) Why did the distilled water potato gain weight?________________ Facilitated Diffusion • Facilitate means “__________________” • Defined: _________________molecules enter/exit with the____________ of _________________ _____________________ in the plasma membrane • ________ energy (__________) used Additional Info Review 1. In which direction does diffusion occur? _______________________________________________________ 2. Across which part of the cell does diffusion mostly occur? _________________________________________ 3. Which molecule of energy is not required during passive transport? ________________________________ 4. True or False: More solutes creates less concentrated water. Explain. __________________________________________________________________________________________
__________________________________________________________________________________________ 5. Which molecule is involved in osmosis? ___________________________ 6. Examine the picture. If the dots are solutes, where is the high solute concentration? ___________________ 7. Examine the picture. If the dots are solutes, where is the high water concentration?___________________ 8. Examine the picture. If the dots are water molecules, where is the low water concentration?____________ 9. Examine the picture. If the dots are water molecules, which way will osmosis occur?___________________ 10. Examine the picture. If the dots are solute molecules, which way will osmosis occur?__________________ 11. Place the steps of oxygen flow in the correct order from start to finish: _____________________________ A – Oxygen diffuses into your cells B – Your heart pumps oxygen‐rich blood around your body C – Oxygen moves into your lungs D – Oxygen gas is inhaled E – Oxygen diffuses from your lungs into your blood 12. Place the steps of CO2 flow in the correct order from start to finish: _______________________________ A – Your heart pumps CO2‐rich blood towards your lungs B – CO2 waste is created by every cell C – CO2 is pushed out of your lungs and out of your mouth D – CO2 diffuses from your blood into your lungs E – CO2 diffuses from your cells into your blood Back Æ
Short Answer:
Explain why a potato slice that weights 5 grams will lose weight after sitting in a container of salt
water for an hour and another potato slice that weighs 5 grams will gain weight after sitting in a
container of pure distilled water for an hour.
Refer to your notes and make sure you include the words: solute(s), water, high concentration, low
concentration, equilibrium, hypotonic, hypertonic, solution, diffusion/diffuse in your answer.
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