Biology_Class_Notes_Section_8.3.doc.

Interactive Class Notes / Learning Log / Textbook Notes Learning Goal: o Relate structure to function for the components of plant and animal cells. o Explain the role of cell membrane as a highly selective barrier (Passive and Active Transport). Think About It When thinking about how cells move materials in and out, it can be helpful to think of a cell as a nation. The boundaries of a nation are its borders, and nearly every country tries to regulate and control the goods the move across those borders. Cells have their own borders, which separate the cell from its surroundings and also determine what comes in and what goes out. How can a cell separate itself from its environment and still allow material to enter and leave? Questions/Main Ideas: Notes: & Key Terms In My Own Words (“How will I remember each term?”) Include Images and Hyperlinks Key Questions What is passive transport? Materials moving through the cell membrane without energy. What is active transport? The movement of materials from one cell membrane to another. Remember to REVIEW these notes daily so you will be ready to participate in class discussion the next day. This practice of daily review will also prepare you for future assessments. Unit: Ecology Chapter: 8 Topic: Cell Structure and Function Section: 8.3 Cell Transport Name: Class: Period/Seat #: Date: Pre Post Scale General Rubric for Student Understanding 4 I understand ........... enough to teach. (I can peer-tutor on this topic) (Expert Teacher - Wow!!) 3 I understand ............ enough to use. (Skilled & Independent!) 2 I understand part of ............, but not............. . (Need some help please!) 1 I do not have an understanding of................. . (S.O.S. - I’m lost; will come for tutoring.) This study source was downloaded by from CourseH on :11:38 GMT -05:00 Make it Personal 1. If you were stranded in on a boat and were really thirsty and dehydrated would you drink the salt water? 2. Would you ever consider holding your ‘pee’ in order to win a Nintendo ‘Wii’? Explain. 1. I would not drink salt water if I was thirsty, because I would only be more thirsty. 2. Um…I’m not sure what this is supposed to mean, but…I guess I would??? Depends how long though, and how bad I need to go. Key Vocabulary Diffusion The movement of materials to a higher-concentration membrane. Facilitated diffusion Spontaneous transport of molecules or ions across a biological membrane Aquaporins All water to pass right through them. Osmosis Movement of water through the cell membrane by facilitated diffusion. Isotonic Two solutions are the ‘same strength’ Hypertonic Having a higher osmotic pressure than a particular fluid. Hypotonic Having a lower osmotic pressure than a particular fluid. Osmotic pressure Pressure applied to a pure solvent to prevent passing into a given solution. Building Vocabulary Prefix- “Endo” The prefix “endo” in endocytosis comes from a Greek word meaning … Making it Visual: Higher Solute Concentration Outside Lower Solute Concentration inside Figure 7-15 Diffusion Predict: How would the movement of solute particles seen here be different if the initial area of higher concentration had been the inside of the cell instead of the outside? Answer: If it was inside the cell, the minerals wouldn’t be as ‘free’. In your notebook Movement of water through an Aquaporin Describe in your own words why osmosis is really just a special type of facilitated diffusion? Answer: Osmosis is similar to simple diffusion, but it describes water molecules moving across a membrane.