Cells Diversity, Size, Basic parts And Prokaryotes vs. Eukaryotes
Cells
Diversity, Size, Basic parts And
Prokaryotes vs. Eukaryotes
Cellular OrganizationLife is Highly OrganizedLiving things are organized in a “Hierarchical” manner – meaning one level is integrated into the next higher level, increasing in complexity
Explain: Cell Diversity
Cells within the same organism show Enormous Diversity in:
1. Size2. Shape3. Internal Organization
1. Cell SizeFemale Egg - largest cell in the human body; seen without the aid of a microscope about the size of a grain of salt
Most cells are visible only with a microscope.
Cells are small for 2 Reasons
Reason 1:Limited in size by the RATIO between their Outer Surface Area and Their Volume. A small cell has more SURFACE AREA than a large cell for a GIVEN VOLUME OF CYTOPLASM.
Why cells are small As a cell grows
larger at some point its surface area becomes too Small to allow nutrients it needs to survive quickly enough to meet the cell's need.
Cells are Small
Reason 2:THE CELL'S NUCLEUS (THE BRAIN) CAN ONLY CONTROL A CERTAIN AMOUNT OF LIVING, ACTIVE CYTOPLASM.
2. Cell ShapeDiversity of form reflects a diversity of function. THE SHAPE OF A CELL DEPENDS ON ITS FUNCTION.
What is this? Structure = function
What is this? Structure = function
What is this? Structure = function
Cells size shape form
http://www.youtube.com/watch?v=SsfSyFliU0M
3. Internal Organization
Basic Parts of a Cell All Cells have:
Plasma membraneCytoplasmControl Center
Plasma membrane
The cells outer boundary – a barrier between the inside and outside of a cell
Cytoplasm
The region that is within the plasma membrane - includes fluids and organelles
Control Center
Cells carry coded information in the form of DNA .In some cells it floats freelyIn others it is surrounded by a membrane and called a nucleus
Prokaryotic Cell
Cell membrane
Cell membrane
Cytoplasm
Cytoplasm
Nucleus
Organelles
Eukaryotic Cell
3. Internal Organization
Two Basic Types of Cells
Prokaryotic Cell
DNA floats in cytoplasm
Two types of cellsEukaryotic Cells
DNA bound in membrane = nucleus
Compare and Contrast
Make a venn diagram comparing and contrasting Prokaryotes vs. EukaryotesGo to page 75
Venn Diagram: Prokaryotic and Eukaryotic Cells
Go to diagram saved