cells: an overview · 2020. 1. 24. · cells: an overview biology –unit 1b. cell theory. cell...
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CELLS: AN OVERVIEW
Biology – Unit 1B
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CELL THEORY
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CELL THEORY
Main Point #1:
Cells are the basic unit of life.
As in- Cells are the building blocks
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CELL THEORY
Main Point #2:
All living things are
made of cells.
Unicellular organism - ONE celled organism
Multicellular organism- MULTIPLE celled organism
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CELL THEORY
Main Point #3:
All cells are made by other living cells.
As in- cells come from cells (mitosis and meiosis)
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WHY DOES THAT MATTER?
• How life works
• How disease works
• Cancer
• Depression
• How to treat diseases
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PROKARYOTES VS. EUKARYOTES
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TWO MAJOR CATEGORIES
OF CELLS
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THERE ARE TWO GROUPS OF PROKARYOTIC CELLS: BACTERIA AND
ARCHAEA
This Photo by Unknown Author is licensed under CC BY
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PROKARYOTES
PRO rhymes with NO
They’re cells with NO
membrane-bound
organelles.
Prokaryotes also have NO
true nucleus.
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MOST PROKARYOTES ARE SINGLE-CELLED ORGANISMS
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EUKARYOTES
EU rhymes with DO
They’re cells that DO have membrane-
bound organelles.
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EUKARYOTES MAKE UP PLANT, ANIMAL, AND FUNGI
CELLS…
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…LIKE THE CELLS OF THIS TREE
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ALL CELLS CONTAIN
CYTOPLASM
Cytoplasm is the
jelly-like filling that
both prokaryotes and
eukaryotes have.
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ALL CELLS CONTAIN
DNA.
All cells have DNA which is necessary
for all cells to function and
replicate.
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THE END