Microbiology - Bacteria Morphology - Discussion

Discussion :: Bacteria Morphology - Section 1 (Q.No.1)

1. 

Which of the following bacteria lack a cell wall and are therefore resistant to penicillin?

[A]. Cyanobacteria
[B]. Mycoplasmas
[C]. Bdellovibrios
[D]. Spirochetes

Answer: Option B

Explanation:

No answer description available for this question.

Amir said: (Dec 15, 2012)  
These is because if someone miss daily use of his/her antibiotics as commanded by physician, the bacteria inside will change in to L-form which cause chronic disease, these is as the result of cell wall break down. Example is Mycoplasma.

Fazal said: (Mar 7, 2013)  
Because these bacteria as you say lack cell wall, so the penicillin attack cell by attaching PBPs. Hence no cell wall, no effect of antibiotics.

Jean Pierre said: (Dec 5, 2013)  
Why not a, since cyanobacteria contain cn-acid group?

Ahmed Hasan said: (Oct 28, 2014)  
Because its lack of cell wall and have steroid.

Mark said: (Dec 1, 2014)  
Mycoplasma because its a mycobacterium and they are difficult to test for unless for acid fast staining.

Yasal said: (May 15, 2015)  
Mycoplasma lack a cell wall around their cell membrane. Without a cell wall, they are unaffected by many common antibiotics such as penicillin or other beta-lactam antibiotics that target cell wall synthesis.

Dr.Ozil said: (Sep 27, 2015)  
It is a unique bacteria. No cell wall and contains cholesterol.

Dancan said: (Mar 23, 2016)  
According to the mechanism of drug action penicillin attack, the cell wall of bacteria but mycoplasma do not contain cell wall so the drug will produce no effect on the mycoplasma bacteria.

Dhathri said: (Apr 7, 2016)  
It means if the there is no cell wall then no antibiotics act on it.

Tomilola said: (Dec 2, 2016)  
Because it lacks peptidoglycan cell wall which covalently binds to another aminoacid of the neighbouring chains hence no transpeptidase which catalyses the reaction. And the mode of action of penicillin is to inhibit the enzyme transpeptidase. Hence why mycoplasma is resistant to penicillin?

Dikshasingla said: (Dec 27, 2016)  
Mycoplasma lacks a cell wall around their cell membrane. Without a cell wall, they are unaffected by many common antibiotics such as penicillin or other beta-lactam antibiotics that target cell wall synthesis. (they attack the cell wall by attaching PBPs).

Ahsanulla said: (Jun 2, 2017)  
There is no cell wall in mycoplasma due to which lack of PBP therefore antibiotic cannot bind.

Munyagwa Stephen said: (Feb 7, 2019)  
Why does it lack a cell wall?

Mulaw said: (May 19, 2019)  
Because these bacteria lack peptidoglycan layer. So, their cell wall which covalently binds to another amino acid of the neighbouring chains hence no transpeptidase which catalyses the reaction. And the mode of action of penicillin is to inhibit the enzyme transpeptidase. So the Mycoplasma Bacteria's lack of cell wall and are resistance to pencillin.

Sree said: (Jul 28, 2019)  
Mycoplasma lack Cell Wall penicilin kill bacteria by inhibiting transpeptidation. A crucial step for cell wall formation therefore, no way of working of penicilian lack of the cell wall in mycoplasma also give it another important charecteristics changing of shape. That's called pleomorphic in nature.

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