why is the nucleus important to the cell?. importance of nucleus controls all of the cell’s...
TRANSCRIPT
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Why is the nucleus important to the cell?
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Importance of Nucleus
• Controls all of the cell’s function• Contains genetic material- DNA and chromosomes
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DNA
• Chemical that contains the information for an organism’s growth and function
• Deoxyribonucleic acid
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Chromosomes
• DNA is packed together to make chromosomes
• Humans have 46 chromosomes in each cell
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Cell Division
• Growth • Development • Repair
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Growth
• Cells need to divide so multicellular organisms can grow.• Adults have about 100 trillion cells
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Development
• Cells develop to become specialized to perform particular functions (skin cells, nerve cells, muscle cells…)
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Repair
• Cells divide to repair the body (cuts-broken bones)• Cells repair and divide at different rates. Skin cells are
constantly repairing, while brain cells live a long time and don’t divide very often.
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Nucleus-Chromosomes-DNA
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Steps of Cell Cycle
1. Interphase
2. Prophase
3. Metaphase
4. Anaphase
5. Telophase
6. Cytokinesis
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Interphase
• Cell begins to grow• Organelles double• DNA is copied• Cell prepare for mitosis-the division of the nucleus
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Prophase
• DNA condenses into chromosomes
• Nuclear membrane begins to disappear
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Metaphase
• Chromosomes line up across the center of the cell
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Anaphase
• Chromosomes are split and pulled to opposite sides of the nucleus
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Telophase
• A new nuclear membrane forms around the separated chromosomes
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Cytokinesis
• The division of the cytoplasm
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Mitosis
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Types of Asexual Reproduction
• Binary Fission-division of prokaryotes• Budding-develop tiny buds that grow into a complete
identical organism• Regeneration-the growth of new cells at a site of lost
body parts