Prokaryotes - Bishop Wordsworth's School

Prokaryotes - Bishop Wordsworth's School

Prokaryotic V Eukaryotic Prokaryotic cells (pro = before, karyote = nucleus) have no nucleus or nuclear membranes. Eukaryotic cells (eu = true, karyote = nucleus) have a nucleus bounded by nuclear membranes. Timeline showing evolution of prokaryotes and eukaryotes Structure of a generalised bacterial cell Nucleoid general area where DNA lies Plasmid small

circular piece of DNA Label your diagram Comparisons.... Prokaryotic cells No true nucleus, only diffuse area(s) of nucleoplasm No nucleolus Circular strands of DNA but no proteins to make up chromosomes No membrane bound organelles No chloroplasts, only photosynthetic lamellae in some bacteria

Ribosomes are smaller (70S) Flagella if present lack internal 9+2 microtubule arrangement No ER or associated Golgi apparatus and lysosomes Cell wall made of peptidoglycan Eukaryotic cells Distinct nucleus, with nuclear envelope Nucleolus is present Chromosomes present in which DNA is located, DNA molecules linear Membrane bound organelles are present Chloroplasts present in plants and algae

Ribosomes are larger (80S) Undulipodia have 9+2 internal microtubule arrangement ER present along with Golgi apparatus and lysosomes Where present, cell wall is made mostly of cellulose or chitin. Evolution of Eukaryotic Organelles

Lynn Margulis Prokaryotes and disease MRSA (methicillin-resistant Staphylococcus aureus) Resistance coded on plasmid DNA bacteria can share plasmids with each other pass on resistance to daughter cells during binary fission Prokaryotes that help Food industry Mammalian intestines Skin Sewage treatment

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