Cells. Cells and their History  All living things are made of cells  Cells are microscopic.

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Presentation transcript:

Cells

Cells and their History  All living things are made of cells  Cells are microscopic

Unicellular Organisms  Just one cell  Can still perform functions necessary for life

History of the discovery of cells  1. Robert Hooke observed dead cork cells under a simple microscope in 1665  Schleiden – proposed plant tissues are composed of cells  Schwann – proposed animal tissues are composed of cells  – Cells come from pre- existing cells

Cell Theory  Developed from observations of Hooke, Schleliden, Schwann and Virchow  1. all living things are composed of cells  2. the chemical reactions which occur in organisms occur in cells  3. cells come from pre-existing cells

Characteristics of all Living Things  1. Greater organization than non- living things  2. Reproduce  3. Grow  4. Respond to stimuli/changes in environment.  5. Homeostatic – try to keep internal environment unchanged  * Must meet all 5 to be alive!

How Cells Work  Cell Organelles  1. structures within cells that perform specific functions (like organs in animals and humans)  2. Cytoplasm is jelly like solution in cells where the organelles float

Cell Processes  1. cells must have ways of eating, breathing and reproducing  2. process are the basis for the corresponding processes in large organisms  Eating = sugar getting to cells for cellular respiration

DNA  DeoxyriboNucleic Acid  Long molecule which directs  proteins production cells  Proteins affect cell processes  and how they perform

Vocab to Know  Aerobe, Anaerobe, Autotroph, Cell Cytology, Cytoplasm, Eukaryote, DNA, Heterotroph, Organelle, Prokaryote, Unicellular

Types of Unicellular Organisms  Prokaryotes  1. AKA bacteria  2. evolved before more complex class of organisms- eukaryotes  3. Do not have membrane bound organelles  4. DNA is arranged in a circular shape

Prokaryotic Cells

Types of Unicellular Organisms  Eukaryotes  1. more complex than prokaryotes because they have membrane bound organelles  2. DNA is linear

Types of Unicellular Organisms  Prokaryotes vs. Eukaryotes  Have the following parts in common with Eukaryotes  1. Cell membrane  2. DNA material  3. Ribosomes  4. Cytoplasm

Eukaryotic Cells

Types of Unicellular Organisms  Heterotrophs vs. Autotrophs  Get food from elsewhere vs. make own food  Aerobes vs. Anaerobes  Organisms that require oxygen vs. organisms which don’t need oxygen

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