Science Starts. *Upcoming Dates: Wednesday Test. 1. How was your weekend? 2. What surrounds a cell? 3. What is it made of?

Transcription

1 Science Starts 1. How was your weekend? 2. What surrounds a cell? 3. What is it made of? *Upcoming Dates: Wednesday Test

2 Cell Membrane & Cell Transport (Page 45) EQ: What is the structure of the cell membrane and how does water move in and out of a cell?

3 Cell Membrane: controls the interactions between the cell and environment. Controls what comes in and out. Receives information from the environment.

4 Plasma Membrane Structure Phospholipid bilayer (2 layers of lipids). Proteins sit in the lipid layers. Some as channels so that large molecules can enter or leave the cell.

5 Vocabulary Equilibrium a state that exists when the concentration of a substance is the same throughout a space

6

7 Transport Processes Passive Transport: No energy needed. Move along a concentration gradient. Move from high concentrations to low concentrations. 2 types: 1. Diffusion: movement of any material from high to low concentrations until equal concentrations are achieved (equilibrium). - Ex: Food coloring diffusing throughout water - Ex: Air Freshener diffusing throughout the room

8 Diffusion

9 Osmosis 2. Osmosis: diffusion of water across a semipermeable membrane. -3 directions of water movement based on the type of solution a cell is in

10 1. Hypertonic Solution - higher concentration of WATER molecules inside of a cell and salt molecules outside of cell, water diffuses out of cell, causing it to shrivel.

11 2. Hypotonic Solution - higher concentration of WATER molecules outside of a cell and salt molecules inside of cell, water diffuses into cell, causing it to balloon.

12 Isotonic Solution - solution with an equal concentration of water inside and outside of cell

13 -Color code: Yellow- Vocab Purple- Main Ideas Blue- Examples Revisions in Red Question: 3 L1 2L2 Reflect/Summarize (minimum 4 sentences)

14 Science Starts 1. What is diffusion? 2. What direction do molecules like to move? 3. What is osmosis? Upcoming: Test Wednesday Notebook check Friday (Pages 40-47)

15 Transportation Demos Page 46 Set Up both experiments: 1: Potato Experiment a. Obtain 2 chunks of potato. b. Make observations BEFORE putting potato into cups. c. Place 1 chunk of potato in a different cup, one with regular water covering the potato, and the other with salt water covering the potato d. WAIT minutes and make final potato observations 2: CornSTARCH Experiment a. Pour cornstarch into plastic bag b. Add a LITTLE bit of water to the cornstarch in bag; seal bag c. Place SEALED bag into cup d. Pour water into cup around bag, add few drops of iodine e. WAIT minutes and make final observations

16 Transportation Demos Page 46 While waiting, complete the following two demos ON page Water and Food Coloring a. Observe b. Draw what you observed c. CER: Why does the food coloring move the way that it does? Make sure to use the following words in your CER: i. Concentration ii. Diffused iii. High iv. Low

17 Transportation Demos Page Smelly Balloon a. Make observations b. CER: What is happening across the balloon s membrane? Make sure to use the following words in your CER i. Concentration ii. Osmosis iii. High iv. Low Return to your potato and corn starch experiment; make final observations

18 Science Starts 1. How do you feel on yesterday s test? 2. What pages are on tomorrow s Notebook check? 3. Compare and contrast osmosis and diffusion. 4. Compare and contrast hypertonic and hypotonic 5. How are the words isotonic and equilibrium related? Upcoming Dates: Wednesday 10/19 Transport Quiz

19 Finish page 45 Notes -Color code: Yellow- Vocab Purple- Main Ideas Blue- Examples Revisions in Red Question: 3 L1 2L2 Reflect/Summarize (minimum 4 sentences)

20 Page 47: Osmosis Foldables - Fold a piece of paper in half, LONG ways - Cut the FRONT FLAP ONLY into three pieces (you will have three foldables) - On the front of each foldable: - Hypertonic - Hypotonic - Isotonic - On the inside - 2 Illustrations (both with color) - One showing the movement of water particles - One showing what the cell would look like in that type of solution - Define in your OWN words (copied from notes or book will earn you ZERO credit for the assignment) -

21 Draw the effects of each

22 Science Starts 1. Describe a cell in a hypotonic solution in your own words. 2. Draw (using arrows) the movement of water across a membrane in an isotonic solution. 3. When we placed the potato in salt water, it LOST water to its environment. What type of solution was the potato in? Upcoming: Wednesday Quiz Please have your notebook out and turned to pages 40-47