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Published byElla Wood Modified over 9 years ago
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Cells
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Cells All living things are made of cells Some have only 1 cell, most are multicellular Most are very tiny Two general types –P–Prokaryotes: no true nucleus –E–Eukaryotes: true nucleus
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Prokaryotes and Eukaryotes Simple, single celled bacteria & cyanobacteria No true nucleus with a membrane. Chromosome simple ring of DNA not bound to proteins. May also have plasmids. No membrane bound organelles. All other cells – e.g. plants & animals Nucleus has a nuclear membrane. 2 or more chromosomes of DNA wound around proteins & highly folded Membrane bound organelles present – e.g. mitochondria Prokaryote = “before nucleus” Eukaryote = “good nucleus”
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Prokaryote cells (bacteria)
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Inside a prokaryote
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General characteristics of Cells cytoplasm membraneCells consist of jelly-like cytoplasm surrounded by a membrane. nucleusA nucleus sits in the cell organellesmembrane systemsVarious organelles and membrane systems are also present
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Size and shape Huge variety Related to function
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Plant cell
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Animal Cell
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Cell membrane
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Nucleus
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Ribosomes
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Golgi body
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What Golgi bodies do
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Lysosomes
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Mitochondrion
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Chloroplast (Plants only)
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Centriole (Animals only)
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Cytoskeleton
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Cytoplasmic streaming Microtubules
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Centrioles help form the spindle for cell division
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Cillia and Flagella
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Cell Wall of plants
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