Docstoc

CELL CYCLE AND

Document Sample
CELL CYCLE AND Powered By Docstoc
					CELL CYCLE

   AND

 CANCER
                     - Cell Division
                  Mitosis
• During mitosis, the cell’s nucleus divides
  into two new nuclei. One copy of the DNA
  is distributed into each of the two daughter
  cells.
     Cell Division
The -Cell Cycle
          - Cell Division

Length of the Cell Cycle
                 How long does it take for a
                 cell to go through one cell
                 cycle? It all depends on the
                 cell. A human liver cell, for
                 example, completes one
                 cell cycle in about 22
                 hours, as shown in the
                 graph. Study the graph and
                 then answer the following
                 questions.
      - Cell Division
Length of the Cell Cycle
            • Reading Graphs:
                – What do the three
                  curved arrows
                  outside the circle
                  represent?

                 –The longest curved
                 arrow represents the
                 cell’s interphase; the
                 shortest represents
                 cytokinesis; and the
                 middle one represents
                 mitosis.
  - Cell Division
Length of the Cell Cycle
               • Reading Graphs:

               • In what stage of
                 the cell cycle is
                 the wedge
                 representing
                 growth?


                    – Interphase
Length of the Cell Cycle
        • Interpreting Data:
          – In human liver
            cells, how long
            does it take DNA
            replication to
            occur?

             –10 hours
    - Cell Division
Length of the Cell Cycle

           • Drawing
             Conclusions:
               – In human liver
                 cells, what stage
                 in the cell cycle
                 takes the longest
                 time?

               – Interphase
                    - Cell Division
           Structure of DNA
• The DNA molecule is shaped like a twisted
  ladder.
• How do the Nitrogen bases pair up?
• Adenine – Thymine
• Cytosine - Guanine
                          - Cell Division
• What is it?        Replication of DNA
• When DNA make exact copy of itself
• Do the nitrogen bases have to match up?
• YES!!
• How?
• Adenine – Thymine
• Cytosine - Guanine
                                              Sequencing
                                  Can you name the stages and phases of
                                              Cell Cycle?
                                Interphase

                                  Cell grows, makes a               Mitosis:
                                     copy of DNA.
    Cytokinesis                                                     Prophase

                                                            Chromosomes and
   Cell pinches in two; each                                spindle fibers form;
daughter cell has same number                             nuclear envelope breaks
  of identical chromosomes.                                        down.

                                The Cell Cycle
 Chromosomes stretch out;                                  Chromosomes line up
new nuclear envelope forms           Mitosis:              across the center and
  around chromosomes.                                     attach to a spindle fiber.
                                     Anaphase
       Mitosis:                    Centromeres split;                 Mitosis:
       Telophase                chromatids separate and               Metaphase
                                 move to opposite ends.
              What Is Cancer?
• Let’s find out
• You will work in groups of 3
• Each group member will learn and then teach
  specific information about Cancer
 to the other team mates!
• 1st member will teach: WHAT IS CANCER
• 2nd member: TREATING CANCER
• 3rd member: CANCER PREVENTION
• Each member will take notes
• Finally everyone will have to answer 3 specific
  questions – we will review them!!
     - Cancer
What Is Cancer?

				
DOCUMENT INFO
Shared By:
Categories:
Stats:
views:25
posted:4/25/2011
language:English
pages:13