…..as units of Life. Ch. 7.1 A View of the Cell CELLS …..as units of Life. Ch. 7.1 A View of the Cell
History 1665-Robert Hooke viewed thin slices of cork under a crude microscope and observed time hollow boxes. He called these boxes cells.
History cont. 1674- Anton van Leeuwenhoek observed tiny living organisms in drops of pond water.
WHAT DO WE MEAN BY: STRUCTURE ? FUNCTION ?
CELLS Basic units of: Structure and Function of all living things.
STRUCTURE= HOW IT IS BUILT/CONSTRUCTED. FUNCTION= WHAT IT DOES, HOW IT WORKS.
History of the Cell Theory 1838- Matthias Schleiden concludes that all plants are made up of cells.
History of the Cell Theory 1839-Theodor Schwann concludes that all animals are made up of cells.
History of the Cell Theory 1855-Rudolph Virchow completes the cell theory by proposing all cells come from existing cells.
The Cell Theory: All organisms are composed of one or more cells The cell is the basic unit of organization for the organism All cells come from pre-exiting cells
Two basic cell types: Prokaryotic & Eukayotic Prokaryotic cells Earliest cells Lack membrane bound organelles No nucleus No mitochondria Have membrane, cytoplasm, free DNA, ribosomes
An Organelle Is: A minute structure within a plant or animal cell that has a particular job or function.
Prokayrotic cells: Bacteria
Eukaryotic cells: May have evolved from Prokaryotic Have a nucleus that holds the DNA inside a membrane Have mitochondria Also have cell membrane & cytoplasm
Nucleus Mitochondria ANIMAL PLANT
Human muscle cells With large nuclei
Human muscle cells With large nuclei
Eukaryotic Cells: are found in animals like Paramecium Nucleus With DNA For reproduction
The power house of the cell: Mitochondria = where energy is released The power house of the cell: Has a membrane like The nucleus ATP
Exception: A Eukaryotic Cell With NO NUCLEUS !
What are some differences between animal and plant cells? ANIMAL PLANT
Organelles found only in Plants: Cell Walls Cellulose Chloroplasts
Plant Cell Chloroplast= absorbs light, changes light energy into chemical energy for photosynthesis = GREEN Cell Wall= forms rigid outer structure, made of cellulose (fiber) Cellulose = carbohydrate found in cell walls
Cell wall Chloroplast Large vacuole PLANT CELL
Both plants & protists have: chloroplasts cell walls cellulose Plant cells Both plants & protists have: chloroplasts cell walls cellulose Diatoms
No Wall, Just a Cell Membrane Animal Cell
Organelles found only in Animal cells: Centrioles = involved in cell division
Found in both Plant and Animal Cells Organelles that surround cells for support: Cytoskeleton = gives structure to a cell Cell Membrane= Semi-permeable, controls what enters and leaves the cell, outer containment envelope.