Cell theory and methods of cell study
Answers are for parents and teachers.
1
Write three points of the cell theory in your own words.
For example: all organisms are made of cells; the cell is the unit of structure and function; new cells arise only from cell division.
2
With a 7× eyepiece and a 40× objective, what is the magnification? Calculate.
280
3
Write two advantages of the light microscope and two of the electron microscope.
Light: living cells can be seen, cheaper, easy; electron: very high resolution, structure of organelles.
4
Why were the “cells” Hooke saw not living cells?
Cork is dead tissue: only thick cell walls remained, with no protoplasm inside.
5
Why can a living cell not be observed in a classical electron microscope?
The sample is placed in a vacuum and damaged by electrons, so the specimen is specially prepared and not alive.