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18 Cards in this Set
- Front
- Back
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What are cells?
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Cells are units of living matter.
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The cells is composed of three layers-what are they?
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Outer-Protine and Polysacharide (sugar)
Middle-Lipid Inner-Protine |
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Substances can be transported across the cell membrane in 4 ways. What are they?
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Through pores
Dissolve in lipid membrane and diffuse through. Active transport mechanism Carrier molocules |
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Describe Cytoplasm
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Semi-fluid like jelly
Not static but constantly being renewed The nucleus and organells are suspended in the cytoplasm Constits of water, glucose, organic and inorganic salts. nitrogenous substances |
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What is the nulceus?
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It is the 'brain' of the cell
It has a dense body and is essential to the cell |
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What is a Nucleolus?
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One or more can be found in the Nuclues and its job is to make ribosomes
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What are Organells?
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They are the visible structures within the cell excluding the nucleus
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What are Mitochondria?
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They are the powerstations of the cell.
They have a greatly folded inner and outer (smooth) membrane |
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What are Lysosomes?
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They are the digestive system of the cells
They contain enzymes |
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What are Vacuoles?
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These are clear spaces within the cell that contain the waste products and bacteria of the cell
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What is the Golgi complex?
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This system sythesises protines, fats and lysosomal enzymes
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What is Endoplasmic reticulum (rough)
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Includes ribosomes
A network of membrane continuous with the nulear membrane |
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What is Endoplasmic reticulum (smooth)
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Is involved in protine and lipid synthesis
A network of membrane continuous with the nulear membrane |
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What are Ribosomes?
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They synthesis protine
They are made in the nucleolus and are composed of mainly RNA (Ribonucleic Acid) |
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What are Centioles?
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Centriols are concerned with cell devision.
They are tubular in shape |
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What is a Centrosome?
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Condenced area of cytoplasm containing two centrioles
Concerned with the movement of chromosomes |
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What is Melanin?
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It is responsible for the pigment found in hair, eye colour etc.
It is a brown/black substance found in cytoplasm |
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What is Haemosiderin?
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Insoluble form of Iron
The apperance of Haemosiderin and Melanin can often be confused |
