Cell Growth and Survival. Biology 2013 Fall Semester. Review:. Cell theory :. All living things are made of cells . Cells are the basic unit of function and structure in living things. Living cells come only from other living cells. Prokaryotes are …. unicellular b acteria.
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Cell Growth and Survival
Plants, animals… humans!
Minerals -------------------- Growth, heat
CELLS & ENERGY
Plants absorb Sunlight during Photosynthesis
Photosynthesis part 1:
Location: thylakoids in the chloroplasts
Light energy used to split water (H20). H’s (hydrogens) stay and O’s (oxygen) is released.
Then the stroma builds glucose during the Calvin Cyle
eat glucose (animals & humanss)
then you need to get energy from glucose using…
Cellular Respiration- Organic compounds (GLUCOSE) broken down to create energy/ATP
*Inputs: oxygen + glucose
*Outputs: energy (ATP) + water + carbon dioxide
So, once cells have their inputs & energy,
how long can they live? What is the life cycle of a cell? Can/could a cell live forever?
Maintains same size,
= 2 identical cells
Ends with cytokinesis (cell splits in half)
Animal cell in anaphase
Plant cell in anaphase
They have the exact same DNA as the parent cell
If a mistake happens during interphase and a cell is able to get past the restriction checkpoint at the end of interphase, THEN
a cell has the potential
to divide forever
Immortal cell: a cell that doesn’t age; a cell that doesn’t die from old age; a cell that never dies.
There is no restriction checkpoint to stop the cell from dividing. (There are no cyclins to stop or allow division).
Cancer cells are considered to be immortal because they never die of old age.
HeLa cells, cancer cells from Henrietta Lacks, have been dividing continuously since 1951.