Catalyst:1. Which of the cells below is the BEST

example of what the celery cells in salt water look like? Explain why.

2. What type of cells are our bodies made of?a. Eukaryotic animal cells c. prokaryotic cellsb. Eukaryotic plant cells d. fungi cells

3. _________ are proteins that speed up chemical reactions.

a. b. c.

Objective: #1 Describe the cell cycle and the steps of

mitosis.

Cell Cycle:

The sequence of growth and division of a cell.

During the cell cycle…

Cell goes through 2 periods Growth period Division period

Growth Period

Interphase: period of growth and copying of DNA for the cell, most of a cell’s life is spent in interphase.

Division Period

Mitosis: period of nuclear division, 2 daughter cells are formed each containing a complete set of chromosomes

What are chromosomes? The carriers of genetic information that are passed from

one generation to the next.

Chromosome Structure

Mitosis: 4 phases

Prophase Metaphase Anaphase Telophase

Prophase

Longest phase of

mitosis Visible chromosomes

form Nucleus begins to

disappear

Metaphase:

Chromosomes are pulled by spindle fibers

They line up on the midline of the spindle

Anaphase:

Centomeres split apart Sister chromatids

pulled to opposite poles

Telophase

2 distinct daughter cells formed

After telophase,cells separate and cytoplasm is divided in a process called cytokinesis

Objective:#2Determine how control of the cell cycle is

related to the formation of cancer cells.

Normal Cell Cycle ControlNormal Cell Cycle Control

ProteinsProteins and enzymesenzymes control the cell cycle.

They control the movement from interphase to mitosis.

What would happen if the cell What would happen if the cell cycle got out of control?cycle got out of control?CancerCancer: a malignant growth of abnormal cells

resulting from uncontrolled cell division

Where in the cell cycle do Where in the cell cycle do things go wrong?things go wrong?Enzyme Enzyme production is directed by genesgenes

located on the chromosomes.

A genegene is a segment of DNA that controls protein production.

Where in the cell cycle do Where in the cell cycle do things go wrong? things go wrong? (continued)(continued)Scientist believe that the portion of interphase

just before DNA replication is the key control

period in the cell cycle.