10/3/2010

Frogs Blood

Title: Sunday October 3, 2010

Homework: -Finish lab questions and 7.2 notes in your book

Body: On Friday during class we continued our lab in the UP, pages 9-14. In this lab we looked at elodea leafs, human cheek cells, onion cells, and frog blood cells.

Part 1 - #1 We prepared wet mounts for the elodea leaf and looked at it through the high power objective in the microscope.

#2 Next we added a drop of Lugols's iodine to the leaf to aid in seeing the organelles clearer. Organelles are the parts of the cell like nucleus, cell wall (for plant cells) and etc.

#3 After looking at both through the high power objective we had to sketch what we saw, title the drawing in the bubbles below the instructions. It looked like green blocks (which was the cell wall) stacked on each other with little dots darker green in color which were chloroplasts.

When idodine was added to the specimen there really wasn't a clearer view except for the orange tinge because of the iodine.

Part 2 We examined a human cheek cell under the high power objective.

#1 First we put a drop of water on the slide. Then we took a toothpick, rubbed it on the inside of our cheeks, then added it to the water. The final step in preparation of the slide was adding a little drop of Methylene blue. The Methylene blue was used to enhance the view of the organelles.

#2 After examining the cheek cells we had to sketch what we saw under the instructions again. The slide looked mostly blue with a darker blue circle in the middle which we all identified as the nucleus. We noticed the shape was not a square like the leaf because there is no cell wall in animal cells.

Part 3 We observed an onion cell in this section.

#1 First we observed it on high power as a wet mount. We then had to draw what we saw. Again, it was mostly like bricks so the cell wall was visible, but the cells were translucent. After drawing this, we added a drop of iodine to the cell. It made the chloroplasts appear which showed as dots around the cell wall, and it gave an orange tinge to the whole onion cell making the cell wall more obvious.

Part 4 We looked at a prepared slide of Frog's blood to see frog blood cells. We had to sketch what we saw for the frogs blood which had a blue background with red circles packed closely together with blue circles inside which was the nucleus. The red circles were the cytoplasm on the inside and the outside was the cell membrane.

Part 5 We answered the analysis questions of the Cell Structure and Function lab. There were 5 questions focusing on comparing and contrasting different cells we observed. The last question had us identify real pictures of the 4 different cells observed.

The next scriber will be. . . . . Lexie.