1 / 13

Introduction to Cells

Introduction to Cells. Topic 2: Investigating Cells Standard Grade Biology. Magnification Cells can be seen more clearly using Microscopes _________________________ the cells Microscopes may have two or three__________________________________________

hallie
Download Presentation

Introduction to 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. Introduction to Cells Topic 2: Investigating Cells Standard Grade Biology

  2. Magnification Cells can be seen more clearly using Microscopes _________________________ the cells Microscopes may have two or three__________________________________________ and one ___________________________________________. microscopes magnify objective lenses eyepiece lens

  3. Calculating Magnification To work out Total Magnification use the following formula TOTAL=x MAGNIFICATION magnification of eyepiece lens magnification of objective lens

  4. Since microscopes magnify cells we have a new unit of measurement. These new units are called _________________________. 1mm = 1000 µm 1 = 1 µm 1000 microns

  5. Measuring Cell Size We can use microscopes to estimate the size of cells we are looking at e.g. if we know the diameter of the field of our field of view we can then estimate the size of the cells

  6. if the field of view = 1mm • then onion cells are • ______________ mm • or ______________(µm) in length Field of view Onion cell 1mm (1000 µm) 0.5 500 microns

  7. if the field of view = 0.5mm or 500µm • then these cheek cells would be • mm or ______________ µm in length 500 5 100 0.5 mm (500 µm) Human cheek cell

  8. 4000 1000 500

  9. Staining Cells Animal and plant cells can be _________________________ so that the ____________________________________ can be______________________________ stained structures within cells seen more clearly

  10. _________________________ stains the • _________________________ of onion • cells and also its • _________________________. Iodine nucleus cell wall

  11. Methyl Blue _________________________ is used to stain the _________________________ of __________________________. nucleus human cheek cells

  12. Acetic orcein _________________________ is used to stain the _________________________ present in the nucleus of cells which are about to divide. chromosomes

  13. This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.

More Related