Chris and Jacob

Alaska Fish Dichotomous Key

Fish Key
1a. spots...go to 2
1b. no spots...go to 10

2a. has a hooked snout salmon
2b. round snout...go to 3

3a. silver tail with...silver salmon
3b. no silver on tail...go to 4

4a. long extended dorsal fin...grayling
4b. non extended dorsal fin...go to 5

5a. rounded dorsal...pike
5b. not rounded...go to 6

6a. spots on tail...go to 7
6b. no spots on tail...dolly

7a. spots on bottom half of the body...rainbow
7b. no spots on bottom...go to 8

8a. has black mouth...king salmon
8b. not black mouth...go to 9

9a. has white mouth...steelhead
9b. not white mouth...go to 10

10a. flat body shape, both eyes on one side...halibut
10b. not flat body, both eyes on different side...go to 11

11a. has jagged gills...chum salmon
11b. has smooth gills...sockeye salmon

Cell Membrane Transport Lab

Focus Question: - How can passive transport be demonstrated using a gelatin "cell" model?
Materials: gelatin cell, beaker, 20-30mL ammonia, filter paper, rubber band, paper towel, rubber gloves, goggles, ruler
Procedure -
Results - At 0 minutes the gelatin was completely clear, At 2 minutes the bottom part of the gelatin was magenta, at 4 minutes the bottom part of the gelatin was still magenta but it was darker though, at 6 minutes 1/4 of the bottom of the gelatin was magenta but it was even darker, at 8 minutes there was no change in the gelatin from 6 minutes, at 10 minutes there was no change in the gelatin from 6 or 8 minutes.

Analysis/Conclusions -
1. Which cell transport process caused the gelatin "cell" to undergo changes without coming in direct contact with the ammonia? Be sure to include what evidence you have that this process occurred.
Its diffusion, because no energy or special channels were used to get the proteins to enter the gelatin and change the color of it.
2. What acts as a selectively permeable membrane in this set up? EXPLAIN why it is selective!
Coffee filter, it only lets certain things through it.
3. Is ammonia an acid, a base or neutral? Support your answer. (HINT: look back at our lab background info carefully)
Its a base because it has a ph level above 7.
4. Insert the 3 Red Blood Cell pictures (RBC1, 2 & 3). Under each picture label the solution that the cell is sitting in as hypertonic, hypotonic or isotonic. ALSO, state whether the water moved into the cell, out of the cell or back & forth.
hypertonic out
hypotonic in
isotonic back and forth
Reflection - We got a chunk of gelatin and placed it above 25mL of ammonia to see if the vapors would affect the characteristics of the gelatin. I learned ammonia is a base not an acid. Both of the experiments used passive transport. But the gummy bears used osmosis while the gelatin and the ammonia used diffusion. And in the gummy bear experiment we dropped the gummy bears directly into the water while the gelatin was suspended above the ammonia using a coffee filter.