Catalyst: 1. Which of the cells below is the BEST example of what the celery cells in salt water...
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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 cells b. Eukaryotic plant cells d. fungi cells 3. _________ are proteins that speed up chemical reactions. a. b. c.
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Transcript of Catalyst: 1. Which of the cells below is the BEST example of what the celery cells in salt water...
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.
