1. RTW Tuesday, November 12 th Name at least one part of the cell theory

2. RTW Tuesday, November 12 th Name at least one part of the cell theory 1.Cells come from pre-existing cells 2.Cells are the basic unit of life 3.All organisms are made of cells

3. Ch. 5.1- Cell Cycle

4. Stages of the cell cycle 4 stages ▫Gap 1 (G 1 ) ▫Synthesis ▫Gap 2 (G 2 ) ▫Mitosis A cell won’t proceed through the cycle until it’s ready ▫Prevents errors (cancer)

6. Gap 1 (G 1 ) First stage of cell cycle Cell carries out its normal function ▫Skeletal cells contracts to move joints ▫Adrenal cells secrete hormones ▫Intestinal cells absorb nutrients, etc. Cells increase in size & organelles increase in number Cells must pass critical checkpoint before proceeding to DNA synthesis

8. Synthesis (S) Second stage Synthesis=“combining of parts to make a whole” Cell makes a copy of its nuclear DNA Contains 2 complete sets of DNA by end of the S stage

9. Gap 2 (G 2 ) Third stage Continues to carry out normal functions Additional growth occurs Another critical checkpoint to ensure adequate cell size and that DNA is undamaged.

10. 2

11. Mitosis (M) Fourth stage Includes 2 processes ▫Mitosis= division of the nucleus and its contents ▫Cytokinesis= division of the cytoplasm Results in 2 genetically identical daughter cells

12. Cells divide at different rates Aligned to your body’s need for those cells In human cells: S, G 2, and M stages together take about 12 hours Cell division is greater in children than adults ▫Their cell cycles are also shorter Certain cells, such as neurons and lymphocytes, divide rarely ▫Usually in G 0 stage

13. Exit Slip Ch. 5.1 assessment pg. 137 ▫#1-5