Book Creator

Science

by 2E-29 YIU WING YI

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Science
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CELL
All living things are made up of cell.
Some living things ,such as Amoeba and bacteria ,are made up of one cell only.
bacteria
They are called unicellular organisms.
Other living things such as animals and plants are made up of more than one cell.
They are call multicellular organisms.
Amoeba
All living things are made up of cell.
bacteria
They are called unicellular organisms.
Other living things such as animals and plants are made up of more than one cell.
They are call multicellular organisms.
Basic structures of cells
Plant cell
Animals cell
Each animal cell is surrounded by a thin layer called the cell membrane.
Similar to an animals cell ,a plant cell also consists of a cell membrane, a nucleus and cytoplasm.
Inside the membrane is a jelly-like substance called cytoplasm.
Surrounded by cytoplasm ,there is a nucleus.
In addition ,a plant cell has a rigid cell wall outside the cell membrane.
Plant cell
Similar to an animals cell ,a plant cell also consists of a cell membrane, a nucleus and cytoplasm.
In addition ,a plant cell has a rigid cell wall outside the cell membrane.
Various types of animals cells have some common basic structures.
There is usually a large vacuole in the cytoplasm.
Some cells in green plants also contain chloroplasts.
Observing cells with a microscope
We can use a microscope to observe cells.
A light microscope used in the school laboratory.
An electron microscope used in research laboratory.
Magnification of the eyepiece
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Magnification of a objective
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Magnification of a microscope
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