“common sense is not so common.” ~ voltaire monday, september 30, 2013 s.c. standards for today...
TRANSCRIPT
“Common sense is not so common.” ~ Voltaire
Monday, September 30, 2013
S.C. Standards for Today: B-2: The student will demonstrate an understanding of the structure and function of cells and their organelles.
Today’s Objectives:• Demonstrate knowledge of passive transport• Illustrate the ways that each type of cellular transport
helps the cell to maintain homeostasis• Egg Osmometer
Reminder: What are you doing for your cell project? With whom are you working?
Warm Up:
1. A student is looking at a cell in a microscope and is able to observe the following structures: a cell membrane, ribosomes, and a region of free-floating DNA. What type of cell is it?
2. What is the function of the golgi apparatus?
What’s your favorite perfume or cologne?
OHow can you smell perfume or cologne that has been applied to another person, even if there is no air circulating?
OPerfume or cologne evaporates and diffuses out from the person that is wearing it.
OWhat does this have to do with cells?
What is homeostasis?
OMaintenance of a stable level of internal conditions, even though environmental conditions are constantly changing
OOur bodies have to maintain homeostasis and without this maintenance we could die.
OCells also have to maintain homeostasis!
What happens if a cell cannot
maintain homeostasis?
O What did people do when they didn’t have refrigerators?
O Early settlers would cover the meat in salt to help preserve it
O The bacteria that were on the meat would die
O Beef jerky is still made this way!
What is Transport?
OMoving materials in and out of the cell
OTwo different types of transport:OPassive: Does not require energy
(ATP) from the cellOActive: Requires ATP
Passive Transport: Simple Diffusion
ONet movement of substances (liquid or gas) from an area of higher concentration to an area of lower concentration
Passive Transport- Simple Diffusion
Name one example of Passive Transport
Passive Transport: Facilitated Diffusion
OTransports larger molecules with the help of a protein gate
OThese protein gates are made for specific molecule passage
Where else have we talked about specificity?
Passive Transport: Facilitated Diffusion
Passive Transport:Osmosis
ODiffusion of water across a semi-permeable membrane
What is an example of a semi-permeable
membrane?
Passive Transport: Osmosis
OHypertonicOSolution that has a high conc. of solute
OHypotonicOSolution having a low conc. of solute
OIsotonicOBoth Solutions have equal solute conc.
This difference (Δ) of conc. of molecules across a space is called a Concentration Gradient
Passive Transport: Osmosis
Animal
Plant
What types of passive transport
did we talk about today?
Passive Transport LabOQuestion: Can osmosis occur
through the membrane of a shell-less chicken egg?
OHypothesis: Write a hypothesis!OMaterials: Vinegar, 6 eggs, bucket,
150 mL beakers, water/sink, paper towels, electronic balance, syrup
OData: (record)OAnalysis/Conclusion: (write)