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# A level Biology help watch

1. HI guys I'm currently stuck on a question can anyone please answer it and explain how you came to that answer: an electron microscope magnifies a nucleus 14 000 x what is its actual size? thanks
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2. Magnification = observed size/actual size. Do you have either the observed or actual size of the nucleus?
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3. (Original post by SPrior3)
Magnification = observed size/actual size. Do you have either the observed or actual size of the nucleus?
Hey man yeah sorry we were given the actual size I didn't see it, it's OK though as I've solved it. Could you perhaps please help me with this next question? A chloroplast is 94 mm long; the scale is 20 mm is equivalent to 3 micrometres, what is the actuAl size of the chloroplast? Thanks
4. I’m not really sure, I haven’t done questions like this in lesson. Would you divide 94 by 20 and then convert it to micrometers? I don’t know, sorry I couldn’t help more.
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5. (Original post by SPrior3)
I’m not really sure, I haven’t done questions like this in lesson. Would you divide 94 by 20 and then convert it to micrometers? I don’t know, sorry I couldn’t help more.
OK that's not a problem that's for your help.

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