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How is Mycoplasma a gram positive bacteria

About microscopic forms of life, including Bacteria, Archea, protozoans, algae and fungi. Topics relating to viruses, viroids and prions also belong here.

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How is Mycoplasma a gram positive bacteria

Postby SweetSarah » Mon Mar 12, 2012 5:54 am

My book mentions that Mycoplasma is a low G+C gram positive bacteria. But how is it gram positive if it lacks a cell wall? Wouldn't it be gram negative then?

...Because if it lacks a cell wall, then shouldn't it stain as pink? And aren't gram negatives stain pink? So,I don't get why it would be considered gram positive then...Can someone explain this please? thanks bunches! :)

**My book states as following: "Mycoplasmas is a second class of low G+C gram-positive bacteria. These are faculative or obligate anaerobes that lack cell walls, which means they stain pink when Gram stained..."

So I get it stains pink, but it also says it's gram positive. So that doesn't make sense. :shock:
It never seems to explain why though...

I hope someone is able to answer here soon/ IF not I may have to ask my teacher but would still like to hear your answers as well just incase
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Postby JorgeLobo » Mon Mar 12, 2012 11:18 am

Based on 16S sequencing, some folks classify Mycoplasma among the Frimicutes - with Gram positive bacteria such as Lactobacillus and Streptococcus spp.
Mycoplasma are not Gram + per se.
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Postby erangasts2 » Thu Aug 14, 2014 12:25 am

Despite the lack of a cell wall, many taxonomists have classified Mycoplasma and relatives in the phylum Firmicutes, consisting of low G+C Gram-positive bacteria such as Clostridium, Lactobacillus, and Streptococcus based on 16S rRNA gene analysis.
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