Two types of cells
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)