Bacteria and Viruses. Do Now Complete Pre-test Meet an E. coli!

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Presentation transcript:

Bacteria and Viruses

Do Now Complete Pre-test Meet an E. coli!

Announcements Homework – complete Microorganism webquest

Bacteria Verus Viruses: What’s the difference? List 3 characteristics of life. Are bacteria (single celled organisms) and viruses (not independent cells) considered alive?

Bacteria: Characteristics of Life Made of cells Pass on genetic information (DNA) Metabolize materials Respond to stimulus Adapt through evolution Maintain homeostasis Cell Membrane Ribosomes Cell Wall DNA

Bacteria: Structure Prokaryotes Unicellular DNA floating inside cell Cell membrane present Cell wall present Ribosomes present Can be seen with a microscope Cell Membrane Ribosomes Cell Wall DNA

Three bacterial shapes : Rod shaped are called bacilli Sphere shaped are called cocci Spiral shaped are called spirilla

How Do We Know Bacteria Are Alive?

Viruses: Characteristics of Life Are not made of cells Cannot reproduce independently multiply only by infecting living cells Do not metabolize materials Do not maintain homeostasis However, they do pass on genetic information

Capsid (protein coat) – inside contains either RNA or DNA Surface Marker DNA or RNA Capsid (protein coat) 2. Flu (influenza), HIV 1. Bacteriophage Viruses: Structure Made of Core of nucleic acids (DNA or RNA) Protein coat (capsid)

Size of Viruses Versus Bacteria Viruses are smaller than even the smallest cell.

Complete the Venn Diagram showing the differences between Viruses and Bacteria Include differences and similarities in size, structure and characteristics of life

Exit Slip Make a question using information from today’s class for an exam on Bacteria and Viruses (can be multiple choice, matching, or short answer).