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Simple Bio Question AS OCR

Can someone explain the need for staining samples for use in light microscopy and electron microscopy? For say 3/4 marks?
Thanks
Reply 1
Avatar for Tillybop
Tillybop
18
Original post by Questionman
Can someone explain the need for staining samples for use in light microscopy and electron microscopy? For say 3/4 marks?
Thanks


Staining makes everything clearer. The sample alone will not be easy to view - because normally they're fairly transparent. Therefore staining is added, and the staining allows you to see the different features and structures much more easily. :smile:
Reply 2
Avatar for Questionman
Questionman
OP
Original post by Tilly-Elizabeth
Staining makes everything clearer. The sample alone will not be easy to view - because normally they're fairly transparent. Therefore staining is added, and the staining allows you to see the different features and structures much more easily. :smile:


Thank You. Going through the spec and want EVERYTHING to be spot on!
Reply 3
Avatar for Shadoo
Shadoo
12
Original post by Questionman
Thank You. Going through the spec and want EVERYTHING to be spot on!


It provides contrast and allows you to differentiate further between features of the sample. It allows you to identify whether certain substances are present or not
Reply 4
Avatar for sayshay
sayshay
5
hi, sorry to sorta hijack the thread but could anyone help with q1 c iii) on this Unit 1 OCR paper:

http://www.ocr.org.uk/Images/59658-question-paper-unit-f211-01-cells-exchange-and-transport.pdf

Idk if i'm overcomplicating it but the mark scheme says:3.75 / 3.8
OR
actual length = 20 x 15 / 80

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