why is the nucleus important to the cell?. importance of nucleus controls all of the cell’s...
TRANSCRIPT
Why is the nucleus important to the cell?
Importance of Nucleus
• Controls all of the cell’s function• Contains genetic material- DNA and chromosomes
DNA
• Chemical that contains the information for an organism’s growth and function
• Deoxyribonucleic acid
Chromosomes
• DNA is packed together to make chromosomes
• Humans have 46 chromosomes in each cell
Cell Division
• Growth • Development • Repair
Growth
• Cells need to divide so multicellular organisms can grow.• Adults have about 100 trillion cells
Development
• Cells develop to become specialized to perform particular functions (skin cells, nerve cells, muscle cells…)
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.
Nucleus-Chromosomes-DNA
Steps of Cell Cycle
1. Interphase
2. Prophase
3. Metaphase
4. Anaphase
5. Telophase
6. Cytokinesis
Interphase
• Cell begins to grow• Organelles double• DNA is copied• Cell prepare for mitosis-the division of the nucleus
Prophase
• DNA condenses into chromosomes
• Nuclear membrane begins to disappear
Metaphase
• Chromosomes line up across the center of the cell
Anaphase
• Chromosomes are split and pulled to opposite sides of the nucleus
Telophase
• A new nuclear membrane forms around the separated chromosomes
Cytokinesis
• The division of the cytoplasm
Mitosis
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