PART ONE: CELL BIOLOGY

1. PART ONE: CELL BIOLOGY

2. Microorganism • . • “Micro” means small… • “Organism” is a life form.

3. Microbiology Micro- smallbio-lifelogy- study ofthe study of small organisms

4. Why was microbiology not studied until the late 1600’s?

5. MICROBIOLOGY- the study of microorganisms . • A microorganism or microbe is a microscopic organism that comprises either a single cell (unicellular) or cell clusters. • The study of microorganisms is called microbiology, a subject that began with Anton van Leeuwenhoek's discovery of microorganisms in 1675, using a microscope of his own design. • Microorganisms are very diverse; they include bacteria, fungi, archaea, and protists; microscopic plants (green algae); and animals such as plankton and the planarian.

6. What makes an item “living”? Living nonliving

7. Use a piece of paper. In your group, brainstorm characteristics that make something “living.”

8. All living things (organisms) have 5 characteristics • Composed of cells • Perform chemical processes such as growth and digestion • They reproduce • Make their own nutrients or ingest them from their habitat • Respond to stimuli such as light or touch

9. Most microorganisms are unicellular (single-celled), but this is not universal, since some multicellular organisms are microscopic, while some unicellular protists and bacteria, like Thiomargaritanamibiensis and algae, are macroscopic and visible to the naked eye. Unicellular organisms are called prokaryotes.

10. Fossil of the cyanobacteria or "blue-green algae," have left a fossil record that extends far back into the Precambrian - the oldest cyanobacteria-like fossils known are nearly 3.5 billion years old, among the oldest fossils currently known. • what it looks like now…

11. THE BACTERIAL CELL Bacteria have a very simple internal structure, NO nucleus and no membrane-bound organelles

12. quick quiz! living characteristics!