intro

• why is DNA passed on?
• what happens when a particular protein is needed?
• diagram

eukaryotic DNA arrangement

• how is DNA stored?
• histones
• how are nucleosomes formed?
• chromatin fibres
• what arrangement protects the DNA?

histones

• what are histones?
• who was responsible for characterizing them?
• why must nucleosomes be altered?
• heterochromatin

prokaryotic DNA arrangement

• in what form are bacterial chromosomes found in?
• supercoiling
• plasmids