bellwork- have slate, marker & eraser on desk 1. draw a before picture of your egg in the beaker...
TRANSCRIPT
Bellwork- Have slate, marker & eraser on desk
1. Draw a BEFORE picture of YOUR egg in the beaker and label where you think these 4 things were at the BEGINNING of the experiment: sugar/salt, water, cell membrane and cell
2. Draw an AFTER picture of YOUR egg in the beaker and label where you think these 4 things were at the END of the experiment: the sugar/salt, water, cell membrane, and cell
3. When finished complete your textbook notes for 3.5 (sections: inside & outside, diffusion, osmosis) OR review the textbook notes if already finished TIME IS UP @ 1:48
Textbook TimeSet up paper for
textbook notes on these sections of 3.5 today:
• Inside & Outside• Diffusion• Osmosis
3.5 Cells and Their Environment Textbook Notes
Vocabulary:1.
2.
3.
4.
5.
6. (not today)
7. (not today)
Inside and Outside-Be prepared to stop:(sentence summaries- 1 sentence summary for each paragraph)
Finished early? Begin graphing solute/ conc vs change in weight for egg lab
IV=X-axis, DV=y-axis
Passive Transport• Passive transport – Solute passes through membrane– NO energy required (like skateboarding DOWN a hill)– Only SMALL, uncharged molecules
Do you see WHERE in the membrane the
small molecules would slip through?
Active Transport• Active Transport– Solute passes through membrane– ATP energy required (like going UP a hill)– Moves large & charged molecules
Do you see WHERE in the membrane the
large/charged molecules would get
moved through?
Passive Transport• Passive transport – A solute passes through the cell membrane– NO energy required (like skateboarding DOWN a hill)– Only SMALL, uncharged molecules can do this
(salt breaks apart into Na+ and Cl- ions, and sugar is
a large macromolecule)
Osmosis!!!• Movement of water
across a semi-permeable membrane:
Water moves from LOWHIGH concentration areas
Memory strategy: “Water follows the salt”
0% salt
25% sugar
What does osmosis tell us about the salt & sugar concentrations INSIDE of the egg if “water follows
the salt”?
50% salt
Does this make sense? Think about what an egg is…