this week in science we did a whole lot of stuff starting off the week by learning the process and the steps of mitosis. we learned that the first procees in mitosis is prophase accoring to the book. Because there are some people that think the first step is interphase but that actually happens before the process of mitosis. Also we learned the last step in mitosis is telophase again that is occuring to the book because people think the the last stadge in mitosis in cytokenise but that actua;lly happens after the procces of mitosis. also we learned what happens in each stadge of the cell, which i am going to put because I got really good info on it from the URL, so if you are not to sure about the different stadges of mitosis i encourage you look at the info below :)http://www.biology.arizona.edu/Cell_bio/tutorials/cell_cycle/cells3.html


Interphase
The cell is engaged in metabolic activity and performing its prepare for mitosis (the next four phases that lead up to and include nuclear division). Chromosomes are not clearly discerned in the nucleus, although a dark spot called the nucleolus may be visible. The cell may contain a pair of centrioles (or microtubule organizing centers in plants) both of which are organizational sites for microtubules.

Prophase
Chromatin in the nucleus begins to condense and becomes visible in the light microscope as chromosomes. The nucleolus disappears. Centrioles begin moving to opposite ends of the cell and fibers extend from the centromeres. Some fibers cross the cell to form the mitotic spindle.

Prometaphase
The nuclear membrane dissolves, marking the beginning of prometaphase. Proteins attach to the centromeres creating the kinetochores. Microtubules attach at the kinetochores and the chromosomes begin moving.

Metaphase
Spindle fibers align the chromosomes along the middle of the cell nucleus. This line is referred to as the metaphase plate. This organization helps to ensure that in the next phase, when the chromosomes are separated, each new nucleus will receive one copy of each chromosome.

Anaphase
The paired chromosomes separate at the kinetochores and move to opposite sides of the cell. Motion results from a combination of kinetochore movement along the spindle microtubules and through the physical interaction of polar microtubules.

Telophase
Chromatids arrive at opposite poles of cell, and new membranes form around the daughter nuclei. The chromosomes disperse and are no longer visible under the light microscope. The spindle fibers disperse, and cytokinesis or the partitioning of the cell may also begin during this stage.

Cytokinesis
In animal cells, cytokinesis results when a fiber ring composed of a protein called actin around the center of the cell contracts pinching the cell into two daughter cells, each with one nucleus. In plant cells, the rigid wall requires that a cell plate be synthesized between the two daughter cells.

This week in science was a little short but we did a lot. for Monday and Tuesday we where doing a lab and also studding for the test on Wednesday. So the lab that we where doing was about the different stages in a cell. so then Wednesday came along and there was the test the test was not to bad if you studded but it was kind of difficult. The test was mostly on the study guide so if you did the study guide good and thorough. Also at the end of the week like just today we got another lab which was a little hard and we have to finish it for homework. We did all this because he wanted us to do well on the test. Also he gave us the blogs so we know what and how the different satdges of cells going into the new unit.

This week in science we did a lot of things pertaining to the test coming up on Wednesday. one of the things that he told us to do is to do 25% of the study guide each week which i think is really helping me because if he did not put that to do as homework i most likely would have of never looked at it and maybe not to so well on the test. But now after doing it and checking if i was right on google i think i have a lot better chance of doing better on the test coming up so i strongly recommend to do it but don't just do it because it is homework you should do it good and theory so it would help you on the test. for instance the first questions on the study guid was types of cells and it named the five cells we have been learning about,Animal, plant, bacteria, eukaryotic, prokaryotic so dont just like name the organells and stuff you should draw a diragram so you have a visual of what it looks like so on the test i think it is easier to remember pictures instead of words and for a lot of the questions you can do that so you might want to think about that. Good luck on the test!!!!!!!!!!!!!!!!!!!

Today in science class we went over the homework questions which were can plants survive under water and can we live without plants. So eventually we all found out that plants can live under water because it pretty much has the same particles as the air has but it can only live under the water under certain conditions. Also we can live without plants because there we be no oxygen. So we pretty much where trying to think of what particles go in the Air and the water most of the period.Then at the end of class Mr.finlley gave us an extra credit question it was why cant fish live out of the water so i did a little reserch on yahoo Answers and Finatic helped me out and said they cant live out of water because Anabantids such as betta and gourami have a labyrinth organ meaning they can breathe directly from the air. Other fish have gills which are a specialized organ that take oxygen from the water allowing a fish to breathe.

Today in science we did and learned a lot of things starting off with what each and everyone of us did over the break which was cool because its cool to know what others do. Well besides that we learned that organells are the parts of a plant and also something new i learned is that like the more mitocondria you have it is like the more muscle you have. also at the end of class we learned what like makes and tranfored to make something for instance like with sunlight you can make energy and so on. we learned all this so we can really know how these things are made withch i think is good.