What is important about cell theory
* the cell is the smallest living unit in all organisms * All living thing are made up of cells* all cells come from other pre-existing cells
What are the 4 levels of organization listed?
1. Cells2. Body tissue 3. Organ4. Organ system
How does a multicellular organism grow?
The cell replicate
How do cells make more cells
They divide or copy
The overgrowth of cells can cause
Cancer
Why do cells become cancer cells?
* genetics* toxins* radiation* UV light
Where do cells spend most of there time
Interphase
All cells do mitosis at the same speed.
False
Do we want cells to divide that have a mutation
No
What are the 3 parts of interphase
1. G12. S3. G2
What happens in the phases
G1: growsG2: DNA replicatesG2: grows more
Checkpoint-G1
Cell growth, make sure DNA is correct before replicating,and correct resources
Checkpoint-G2
Cell growth, correct DNA replication, and correct resources
Checkpoint-mitosis
Metaphase, make sure chromosomes line up in the middle correctly
What happens if the cell doesn't meet the requirements at the checkpoints
1. Cell gets a chance to fix itself2. A-POP-tosis
What are 3 examples of what your body would do when in undergo mitosis
1 cut2 nail growth 3 body growth
What does mitosis do
Divides cells/make more
If Mitosis does not produce sperm or egg cells. What does
Meiosis
What is cancer
uncontrolled cell growth
What does a cell do in interphase
1 grows 2 replicate dna3 grows more
What percent does a cell stay in interphase
90%
What percent does a cell stay in mitosis
10%
In order to keep thing in organized in mitosis, DNA is condensed into units called
Chromosomes
How many chromosomes does a human body have
46
DNA is duplicated before/after mitosis begins
Before
What does PMAT stand for
prophase, metaphase, anaphase, telophase
Prophase
Nuclear membrane disappears
Metaphase
Chromosomes line up in the middle of the cell
Anaphase
Spindle fibers pull chromosomes apart and turns into chromtids
Telophase
2 nucleus, chromatids make copies
Cytokinesis
Cells split