2/2/12- Biology-Second Semester Homework: Short Checkup on Monday on Water Movement and Concentration. Things to know: 1)Final exams are not being returned. 2)Come to tutorial if want to review your answers. 3)There will NOT be test corrections for the final exam. 4)Semester Grades will be posted by district due date of Feb 10. 5)Yes, grades start over today! 6)Today is the day to start a new logbook 7)New link at biology website

bellevuebiology.wikispaces.com

Make an entry: Entry 1: EGG DEMO- 2/2/12 Answer the warm up questions below: 1.Why can’t a freshwater fish stay in saltwater for a long time? 2.Why can’t a land plant be watered with salt water? 3.Why can’t a saltwater fish stay in freshwater for a long time?

No Salt Low SaltHigh Salt Lots of bacterial growthSome bacterial growth Little bacterial growth

No Salt Low Salt High Salt

Why is Transport Important to Living Things? Think back: We eat food. So what? How do the nutrients get from our stomach/small intestine to our cells? 1.Cells must maintain a balance of water and solute (things in the water) 2.Cells must be able to get all of the materials necessary for it to survive and function 3.Cells must be able to get rid of waste products. (many of which are toxic)

In this unit we will learn: 1.HOW water and other molecules move into or out of a cell 2.THE STRUCTURE of the cell membrane that allows materials to pass in or out of the cell

Corn syrup (Karo light) Egg whites Water More concentrated solution OUTSIDE cell Less concentrated solution inside cell More concentrated solution INSIDE cell Less concentrated solution outside cell Same concentration inside and outside of cell (CONTROL)

Corn syrup (Karo light) Egg whites Water More concentrated solution OUTSIDE cell Less concentrated solution inside cell More concentrated solution INSIDE cell Less concentrated solution outside cell Same concentration inside and outside of cell (CONTROL) Before: g Before: g Before: g

Corn syrup (Karo light) Egg whites Water More concentrated solution OUTSIDE cell Less concentrated solution inside cell More concentrated solution INSIDE cell Less concentrated solution outside cell Same concentration inside and outside of cell (CONTROL) After: 28.51g After: g After: 59.2 g

Corn syrup (Karo light) Egg whites Water More concentrated solution OUTSIDE cell Less concentrated solution inside cell More concentrated solution INSIDE cell Less concentrated solution outside cell Same concentration inside and outside of cell (CONTROL) Percent change in size of egg _________ Percent change in size of egg _________ Percent change in size of egg _________ %-2.6 % +50.2%

Based on these results, which way does water move? (don’t just say “out” or “in”) Water moved toward the side that was more concentrated (had more “stuff” in it)

In your own words: What does concentration mean? (in terms of solutions) 10 ml of water compared to1 liter of the same water – which is more concentrated? 10g of salt in a liter of water compared to 100g of salt in a liter if water—which is more concentrated?