Transcript CELL THOERY Sun Hwa Dong

CELL THOERY
Sun Hwa Dong
CELL
Cell Theory
• All living things are
composed of cells.
• Cells are the
smallest unit of life.
• All cells are from
pre-existing cells
by cell division.
History of Cell Theory
• Robert Hooke- 1st discovered the cell
• Antony Van Leeuwenhoek-1st observed
a living cell using microscope.
• Schleiden & Schwaan- “Plants and
animals are made of 'independent,
separate beings' called cells.”
Modern
Interpretation
+ Original Cell Theory
1. The energy flow take place within cells.
2. Cells contain DNA that is inherited from cell to
cell in the progress of cell division.
3. All cells are basically identical in chemical
composition in organisms of similar species.
4. The total activity of independent cells decides the
activity of an organism.
Unicellular organisms
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Metabolism
Response
Homeostasis
Growth
Reproduction
Nutrition
Multicellular organisms
• Specialized for specific
function: differentiation
• Uses genes in nucleus,
but not others: gene is
being expressed
• Ex: Red blood cell
carries oxygen around
the body
Bibliography
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Study Guide pg 3
Course Companion pg 4
www.studystack.com/flashcard-29229
en.wikipedia.org/wiki/Cell_theory
scienceaid.co.uk/biology/plants/cells.html
lgfl.skoool.co.uk/examcentre.aspx?id=208
Vocabulary
• Cell membrane: a thin structure that surrounds
both plant and animal cells and its main job is to
determine what can enter and exit the cell.
• Cytoplasm: jelly-like substance between cell
membrane and nucleus.
• Mitochondria: “power producer” of a cell.
• Metabolism: chemical reactions inside the cell,
including cell respiration to release energy
• Homeostasis: keeping conditions inside the
organism within tolerable limits