Download Prokaryotes vs Eukaryotes in Protein Synthesis

Prokaryotes vs Eukaryotes
Part of Protein Synthesis
Prokaryotes vs Eukaryotes: Protein Synthesis
Prokaryote
Eukaryote
Order of Protein Synthesis Coupled transcriptiontranslation = translation
can begin before
transcription finishes
Transcription must finish
before translation begins
Introns and Exons
Do not contain introns
Contain both introns and
exons
Recognition by Ribosome
Ribosome recognizes a
purine rich area on mRNA
Ribosome recognizes the
guanine cap at the 5’ end
of the mRNA transcript
Size of Ribosome
Small
Large
Gene Regulation
Uses operons
Don’t contain operons
Chromosome Structure
1 circular chromosome
Many chromosomes
Did Eukaryotes Come From Prokaryotes?
• Scientists think eukaryotes may have evolved from
an endosymbiotic relationship between
prokaryotes of mitochondria and host parasitic
cells
• Mitochondria may have been primitive prokaryotic
cells with compartmentalized organelles
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Have circular genomes not contained within nucleus
DNA sequence similar to bacterial cells
Divide by fission within eukaryotic cell similar to bacteria
Own system of DNA synthesis, transcription, & translation
indicating they many have once been free living
Homework
• Pg 265 Questions 2 and 5