Cell
Structure
Cell Theory
Two types of cells
Prokaryote
Eukaryote
A digression: What
is this DNA stuff all about?
Genes are
made of DNA
A
chromosome is a strand of DNA many genes long
We inherit a complete set of DNA
instructions from each parent
Having two
copies of each gene helps protect us from "copying errors"
A
change in the instructions produces a mutation
Why are cells so small?
There are
two physical limits on cell size
1.
relationship between surface area and volume
2.
nucleus can only exert regulatory control over a limited
area
Cell functions and cell organelles
Control of
activities
Transport
of materials in and out of cell
Access to
energy
Origin of eukaryotic cells
Endosymbiont
theory (Lynn Margolis)