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dear learners today we are going to talk about the mcqs from microbiology and the topic is bacteria we are going to cover part 3 few of the mcqs from the bacteria in our earlier video part one and part two we have seen few possible mcqs on the same topic that is bacteria so to start with part three first question is the question says cell wall of gram negative bacteria is whether it is thick gram negative they are asking whether it is thick whether lipids are present whether ticoic acid is absent or none of them thick it is correct lipids present is correct acid are absent and none of these the correct answer is it is ticoic acid is absent now why as you can see the structure see this is gram positive and this is gram negative in gram positive you can find lipotic acid acid so this is cytoplasmic membrane above that peptidoglycan is layer in gram negative there is very less peptidoglycan and lipopolysaccharide is there lipoprotein and above that there is o antigen core lipidae which is