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CHAPTER 1 – CELL STRUCTURE & ORGANISATION
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This document is the first chapter studied in 10th grade Biology.
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BIOLOGY O Level (5090)CHAPTER 1: CELL STRUCTURE & ORGANISATION
The Cell
⚫ Cells are sometimes referred to as the basic unit of life, since they are the units which
makes the living organisms.
⚫ Cell are, in turn made up of small components called organelles, which each carries
out its specific functions(s).
⚫ The organelles of a cell may be seen under the light microscopes or electron
microscope.
⚫ The differences between both microscopes are listed in the table below.
⚫ Micrographs are photographs that are taken by cameras mounted on microscopes.
⚫ These are used to identify the various components of cells.
⚫ Photographs taken from light microscopes are called light micrographs.
⚫ Photographs taken from electron microscopes are called electron micrographs.
, ⚫ A cell may be section in order to see its internal structure.
⚫ Longitudinal sections (L.S) are slices taken along the length of a cell.
⚫ Transverse sections (T.S) are slices taken across the length of a cell.
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