Scribe 10/6/11

Hey everyone! Today in class, we took a short quiz on cells and organelles, and we also took some notes, and did a lab!

Homework:

• Finish Lab UP on page 36-37 (page 211 in the book will help)
• Bring goggles to class for tomorrows lab!

Notes: Today we discussed what catalysts and enzyme

s are, and why they're important.

• Catalyst: a substance that speeds up a chemical reaction
• Decrease the amount of energy needed to start the chemical reaction
• After the reaction, the catalyst stays the same way that it started

• Enzymes: proteins that act as biological catalysts
• Affected by changes in pH, temperature, and substrate concentration
• Also makes the reaction faster

Lab Review:

Normal and Plasmolyzed Cells-

Our job was to make two wet mounts. One wet mount was of an Elodea leaf with two or three drops of tap water on it. The other wet mount was of an Elodea leaf with two or three drops of 6% salt water. After we had added the coverslips, we placed them under the microscope to examine the difference. We were supposed to label the cell wall, cell membrane, and chloroplasts in both cells.

Here are a few images of our results:

First Wet Mount- Normal Cell

Second Wet Mount- Plasmolyzed Cell (6% Salt Water)

It is shown that the first wet mount compared to the second wet mount is very different.

Well thanks everyone! Hope to see you tomorrow!

The next scribe will be: Samantha