3/10 – Tuesday – period 7 – Academic Study Hall
period 8 –
1: work of Homework forms
2: data gathering and graph making (instructions in homework last night) for cell membrane lab.
3. Limitations in Lab based on data.
diffusion/passive transport = spontaneous
Active transport – (require ATP) = nonspontaneous
Reverse osmosis = non spontaneous.
1: Cell Membrane lab requirements
2: Osmoregulation in Paramecium/protists/ reverse osmosis – non
3. Stomata/guard cell –
5: Pores in the Cellulose tubing
– up to slide 28 in the Cell membrane presentation
Cell Membrane Whiteboards: And the winner is!!!!!!!
3/10 – Tuesday Homework-
1: Please use your book to begin your initial learning of Cell – Cell communications that result from receptors on the cell membrane, completing the form below:
2: Cell Membrane Lab – write-up – Informal due this Thursday
3. Water Potential Test – This week ! (This Friday!)
Here are the keys to the 2 forms this week.
Cell communication form: Form is now open
End of Tuesday..
3/11 – Wednesday – Period 7/8 –
60 minute segment on gene therapy
*ORDER PAINTED L FOR WEEK 7 or 8 ARRIVE MONDAY.
1. Diffusion Lab – Surface area to volume ratio
2. Diffusion races – design a cell – Winner has the greatest mass to second ratio.
Why do we need cells? Why are they so small small? Why are prokaryotes smaller than eukaryotes?
CELL RACES RULES:
- No donut-like holes through the agar cell — cell membranes cannot sustain that shape.
- No poking, prodding, touching beaker containing agar cell in vinegar.
- Teacher determines when 100% diffusion takes place.
- Students mass agar at conclusion of race…cell must not break when handled. Disqualification if cell breaks upon massing (although you can be a bit lenient here).
- No slivers or shaved cells. Cells must be at least 1 cm in width.
- Winner = highest ratio of mass divided by time.
3/11 Wednesday HW:
1: Cell Communication Form 2 –
2: Diffusion Lab Due – Thursday 3/12 –
You have all you need to complete the lab, using the video for each class posted above.
This is a packet lab we will complete tomorrow.
3: Cell Membrane lab – due Friday 3/13 .
NOW what can we take from the Diffusion Lab that will help us in out error discussion? Hmm? Did you make all of your model cells the same size and shape? How would this affect osmosis (which is passive diffusion of water)?
Cell membrane Lab – (Rate of Osmosis) requirements: On separate paper of your choosing.
a) You will need a sketch or diagram of each different cell (labeling the intracellular and extra cellular chemical
and their respective concentrations.
b) Calculate the water potential for the cell and extracellular fluid and label your diagram with those values.
Show all calculations
c) Label the intracellular and extra cellular as either Isotonic, Hypotonic, or Hypertonic.
d) Draw an arrow in your sketch that illustrates the net movement of water (from high potential to lower
potential). The ARROW and its size is really your hypothesis. The size of your arrow is how
you rank your test cells in terms of the greatest rate of diffusion. Remember this is a rate
(speed or time) lab.
e) Place your graph with its slope alongside the sketch.
g) Write a conclusion that analyzes your results. Some cells will not lose or gain mass as you suspect because
dialysis tubing is really cellulose which compromises the cell wall of plants and is not semi-permeable as you
expected in your calculations. Its pores allow water to diffuse AS WELL as Ca+2, Na+1, Cl- . Sucrose is too large to pass through. If you remember that dialysis was used to diffuse out urea, water, and ions out of the blood
when the kidneys are not functioning properly, this makes sense.
3/12 – Thursday – Period 7 – Academic Study Hall –
1. Cell design part of the lab
2. Lab questions –
– completed math to determine the winner
– completed questions in class
– Handed in the packet lab into the purple crate of fun.
3/12 Thursday Homework: – Test Friday – Water Potential problems only!
Water Potential worksheet review lecture:
Water potential review lecture:
This Year’s Cell Diffusion races:
Congrats to the winners!
Honorable Second Place did not win group:
3/13 – Friday – Period 7/8-
– Water Potential Test – period 7
– Energy Dynamics lab – period 8
Painted Lady Butterfly Lab Begins-
a) growth chambers measured
Write name of group on the top lid with sharpie.
1. Mass out Cup, Lid, and tissue paper. Write C = ____g on cup.
2. Add about 12 g food by taring the cup. Write F = _____g on cup.
3. Add 2 – 4 Larva per Cup. Tare out cup with food to measure just the mass of the larva. Write L = _____g on cup.
4. Place the entire system, cup, tissue, lid, larva on scale and find entire mass.
write total = ________ g on cup.
3/13 – Friday – Weekend Homework:
HW: We are digging into Chapter 11!
Chapter 45, Chapter 11
1. Please use the Google Doc that I have linked with you and complete the following:
I would like a mini-report on the “Fight or Flight” response that must include the following:
A) Epinephrine –
B) Signal Transduction pathway – of Epinephrine – (diagram of pathway)
1) specifics about how the chemical signal produces a response
2) What type of receptor was used (pages 211 – 213)
3) How does does cAMP fit into the other parts of our course?
You must use the following the terms:
If you use other sources beside the text then you have to show sources.
THis should not exceed 2 pages.
Have a weekend..