Period 4 Microscopes Friday, March 4

Do you know who your group leader is?
Mr. Finley started something new and now each group MUST have a group leader!!!

We went over the questions we did on Tuesday.

Question answers
3.1

1. Cell division is important becasue it helps multi-cellular orgainisms to grow develop and repair. Single-celled organisms use cell division to reproduce.
2. Genetic material in cells is orgainized and contained in the DNA in the nucleus. It contains the cells information for the organisms growth and functions.
3. Cell division is involved in growth, development ,and repair of an organism. In growth the cells grow until they no longer can and split off to create new cells. In develompment the cells develop special characteristics from the cell it split from. When cells repair they replace the old ones with the new ones.
4. DNA compacts before eukaryotic cells divide. The chromosones get compacted around a spool. The chromosones compact more and more and once they've compacted a lot they can be visible under a microscope.
5. Injuries to the skin heal faster because the skin cells heal faster than the cells in your brain.
6. MR. FINLEY DIDN'T GO OVER!!
   

3.2

1. The two main parts of the cell cycle are interphase and mitosis.
2. The cell is growing for mitosis preperation.
3. The genetic material in 2 daughter cells is similar to the genetic material in 2 parent cells because the the daughter cell broke from the parent cells causing them to both have the same genetic materials and characteristics. Ex. Mother and father dog compared to their litter of puppies.
4. First, prophase. Second, metaphase. Third, anaphase. And fourth, telophase.
5. Animal Both Plant
   *Membrane pinches *Divide *Wall splits
6. MR.FINLEY DIDN'T GO OVER THIS ONE!!
   

We then used the microscopes. We looked at the tip of an onion root. Here is an example of what we saw:

Mr. Finley then gave us a sheet to do about what we saw. Here are the questions asked on the sheet.

1. You are looking at cross-sectional slices of the tip of an onion root. Why might you expect an onion root tip have cells that are dividing?
2. Find and look at all three of the slices briefly. What are the dyded objects inside the cell?
3. Is there evidence of cellular division? Explain.
4. Draw at least 4 different cells at what you will call "different stages". Only draw ONE cell in each box and label the stage.
5. Explain why you believe the cell is in each stage.

The bell rang while we were still working but Mr. Finley said we didn't have to finish it. You could if you want to.

E.M. 4th time around