Summary
Summary OCR A/AS-Level Biology 2.1.4-7 Prokaryotic and Eukaryotic Cells
Revision summary of key knowledge from OCR A/AS-Level Biology 2.1.4-7 Prokaryotic and Eukaryotic Cells.
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Prokaryotic and EukaryoticCells
Similarities
Plasma membrane
Cytoplasm
Ribosomes
DNA and RNA
Differences
Prokaryotes are smaller and have smaller ribosomes
Prokaryotes have no nucleus and free genetic material
Prokaryotes have no membrane-bound organelles
Prokaryotes are less developed/more primitive
Endosymbiotic Theory
Theory that eukaryotes evolved from prokaryotes
Prokaryotes with an infolded membrane capable of holding ATP invading other
prokaryotes and were engulfed but not digested
The membrane folded inwards around the invading cell, producing a double membrane
The invading cells became chloroplasts and mitochondria which share features with
prokaryotes:
o Small ribosomes
o Loops of DNA
o Contain RNA
o Can divide by binary fission
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