Changes

Prokaryotes are extraordinarily diverse:

Prokaryotes are extraordinarily diverse:

   

   

Proteobacteria - Gram-negative, two cell membranes, hugely diverse, Escherichia coli.  

Firmicutes and Actinobacteria - Gram-positive, thick peptidoglycan cell wall.  

:Proteobacteria - Gram-negative, two cell membranes, hugely diverse, Escherichia coli.  

Spirochaetes - helical bacteria.  

:Firmicutes and Actinobacteria - Gram-positive, thick peptidoglycan cell wall.  

:Spirochaetes - helical bacteria.  

Prokaryotic DNA lacks histones (packaging proteins) and molecules have direct access to DNA. They have a junk-free genome, transcribed by just one RNA polymerase. Transcription leads to translation with no intermediate processing, which allows several genes to be encoded in a single transcriptional unit (a polycistron). They have small (70S) ribosomes.

Prokaryotic DNA lacks histones (packaging proteins), although other packaging proteins are present,  and molecules have direct access to DNA. They have a junk-free genome, transcribed by just one RNA polymerase. Transcription leads to translation with no intermediate processing, which allows several genes to be encoded in a single transcriptional unit (a polycistron). They have small (70S) ribosomes.

[[Category:biology]]

[[Category:biology]]

[[Category:microbiology]]

[[Category:microbiology]]