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Patterns in Nature Topic 4: Cell Structure and Functioning. Part of the Patterns in Nature Module Biology in Focus, Preliminary Course Glenda Childrawi and Stephanie Hollis. Introduction: Levels of Organisation.
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Part of the Patterns in Nature Module
Biology in Focus, Preliminary Course
Glenda Childrawi and Stephanie Hollis
Some living things however consist of only 1 cell that carries out all of its life functions. These are called unicellular organisms.
The term ‘cell’ is used to describe the basic unit of any organism, whether its only one unit or consisting of many units.
The general contents of cells can be studied using the light microscope. Electron microscopes can provide us with greater details.
Cells vary greatly in shape, size, structure and function. There is no ‘typical’ cell. To allow a general understanding of the structure and functioning of cells, a hypothetical cell of plants and animals is often studied.
Cells that are found in plants and animals have the same basic features with some variations. Over the next few slides we are going to explore the parts that are visible with a light microscope.
90% of the cytoplasm is water which is the medium in which all cell chemicals are dissolved or suspended.
It is the control centre of the cell
It controls the passage of water and other chemical substances into and out of the cell
Plant cells have some additional structures which can be viewed under a light microscope.
These structures are exclusive to plant cells and therefore not usually found in animal cells.
Chloroplasts are responsible for photosynthesis (the manufacture of sugar in plants, using the energy from the sun)
Vacuoles are used for storage but also play an important role in providing the plant with support.
To compare two things, both similarities and differences must be examined. A good way to compare plant and animal cells is using a diagram.
Answer the following questions in your notebook. Be prepared to discuss next lesson.
Hand out Observing Plant and Animal Cells PRAC and discuss for next lesson.