Ch 20 Introduction

Ch 20 Introduction

Properties of Life:

• Grow and develop

• Reproduce

• Respond

• Use energy

• Maintain homeostasis

• Are organized

• Adapt and evolve

Prokaryotes

• single celled

• lack nucleus and internal compartments

Bacteriophages

• Virus that infects bacteria

• Consist of a nucleic acid surrounded by a protein coat (capsid)

DNA vs RNA

• DNA- double stranded; contains thymine (T); deoxyribonucleic acid

• RNA- single stranded; contains uracil (U); ribonucleic acid