9-11 Lecture

Characteristics of Life

• Growth
• Metabolism
• Homeostasis
• Water
  • H2O
  • Body is 65% oxygen
  • Water is a solvent
    • Solute: what is being disolved (salt)
    • Solution: the solute in the solvent (salt water)
  • makes things go

Macromolecules

• Carbs
• Proteins
• Nucleic acids: chain of nucleotides
• AT have two bonds
• CG have three bonds

Body Composition

$280\ast .6=168$lbs of oxygen
$280\ast .18=50.4$lbs of carbon
20% hydrogen
2% nitrogen

Major types of cells

Prokaryotic (single celled)

• no nucleus
• small and simple in structure
• ex. bacteria
  Eukaryotic (mostly multi-cellular)

All cells are either prokaryotic or eukaryotic