1 / 13

Cells

Cells. Anne Tierney, University Teacher Room 938, Boyd Orr Building a.tierney@bio.gla.ac.uk. Available through the Centre for Bioscience www.bioscience.heacademy.ac.uk/resources/projects/tierney.aspx. Intended learning outcomes. Know what constitutes a cell Describe a typical cell

Download Presentation

Cells

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Cells Anne Tierney, University Teacher Room 938, Boyd Orr Building a.tierney@bio.gla.ac.uk Available through the Centre for Bioscience www.bioscience.heacademy.ac.uk/resources/projects/tierney.aspx

  2. Intended learning outcomes • Know what constitutes a cell • Describe a typical cell • Prokaryote • Eukaryote • Calibrate a light microscope • Measure cells using a light microscope

  3. What is a cell? • Get into groups of two or three • You have five minutes to think of everything you can that defines what a cell is • Feed back to the class

  4. Prokaryote Simple 1-2μm No nucleus No organelles Single chromosome Types of cell - prokaryote

  5. The most common shapes of prokaryotes • Cocci – round • Bacilli – rod-shaped • Spiral

  6. Eukaryote Complex 5-100μm Membrane-bound nucleus Several types of organelle Several chromosomes Single-celled organisms Multi-cellular organisms Types of cell - eukaryote

  7. A eukaryotic cell - animal

  8. A eukaryotic cell - plant

  9. How do we measure cells? • Cells are (usually) too small to see with the naked eye • Visualised with a microscope • How can we measure with a microscope? • Done indirectly • Comparing a known scale with a scale that can be calibrated

  10. Measuring cells • eyepiece graticule • stage micrometer

  11. How do we do it? • We compare the known scale (stage micrometer) to the scale that is to be calibrated

  12. Calibrating the eyepiece graticule • The eyepiece scale is UNKNOWN • The stage scale is KNOWN • 100 stage divisions = 10mm • Calibration must be done for every magnification

  13. Calibrating the eyepiece graticule • 100 eyepiece divisions = ____ *stage divisions • We know that 100 stage divisions = 10mm • 1 stage division = ____mm • ____ *stage divisions = ____mm • 100 eyepiece divisions = ____mm • 1 eyepiece division = ____ mm or ____μm • Repeat this for each magnification

More Related