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Introduction To Cells PowerPoint Presentation

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Introduction To Cells Presentation Transcript

Slide 1 - Introduction to Cells Topic 2: Investigating Cells Standard Grade Biology
Slide 2 - Magnification Cells can be seen more clearly using Microscopes _________________________ the cells Microscopes may have two or three__________________________________________ and one ___________________________________________. microscopes objective lenses magnify eyepiece lens
Slide 3 - Calculating Magnification To work out Total Magnification use the following formula TOTAL = x MAGNIFICATION magnification of eyepiece lens magnification of objective lens
Slide 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
Slide 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
Slide 6 - if the field of view = 1mm then onion cells are ______________ mm or ______________(µm) in length 1mm (1000 µm) Field of view Onion cell 0.5 500 microns
Slide 7 - if the field of view = 0.5mm or 500µm then these cheek cells would be mm or ______________ µm in length 0.5 mm (500 µm) Human cheek cell 500 5 100
Slide 8 - 4000 1000 500
Slide 9 - Staining Cells Animal and plant cells can be _________________________ so that the ____________________________________ can be______________________________ stained structures within cells seen more clearly
Slide 10 - _________________________ stains the _________________________ of onion cells and also its _________________________. cell wall nucleus Iodine
Slide 11 - _________________________ is used to stain the _________________________ of __________________________. Methyl Blue nucleus human cheek cells
Slide 12 - _________________________ is used to stain the _________________________ present in the nucleus of cells which are about to divide. Acetic orcein chromosomes
Slide 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.