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CELL CYCLE AND PowerPoint PPT Presentation


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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.

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CELL CYCLE AND

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Cell cycle and l.jpg

CELL CYCLEAND

CANCER


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- 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.


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- Cell Division

The Cell Cycle


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- 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.


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The longest curved arrow represents the cell’s interphase; the shortest represents cytokinesis; and the middle one represents mitosis.

Reading Graphs:

What do the three curved arrows outside the circle represent?

- Cell Division

Length of the Cell Cycle


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Interphase

Reading Graphs:

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

- Cell Division

Length of the Cell Cycle


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- Cell Division

10 hours

Interpreting Data:

In human liver cells, how long does it take DNA replication to occur?

Length of the Cell Cycle


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Interphase

Drawing Conclusions:

In human liver cells, what stage in the cell cycle takes the longest time?

- Cell Division

Length of the Cell Cycle


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- 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


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- Cell Division

Replication of DNA

  • What is it?

  • When DNA make exact copy of itself

  • Do the nitrogen bases have to match up?

  • YES!!

  • How?

  • Adenine – Thymine

  • Cytosine - Guanine


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- Cell Division

The Cell Cycle

SequencingCan you name the stages and phases of Cell Cycle?

Interphase

Cell grows, makes a copy of DNA.

Mitosis: Prophase

Cytokinesis

Chromosomes and spindle fibers form; nuclear envelope breaks down.

Cell pinches in two; each daughter cell has same number of identical chromosomes.

Chromosomes line up across the center and attach to a spindle fiber.

Chromosomes stretch out; new nuclear envelope forms around chromosomes.

Mitosis: Anaphase

Mitosis: Telophase

Centromeres split; chromatids separate and move to opposite ends.

Mitosis: Metaphase


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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!!


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- Cancer

What Is Cancer?


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