What color are gram positive and gram negative bacteria on a gram stain?

gram + are blue, gram – are red More test answers on https://studyhippo.com/10-17-intro-to-bacteriology-16/

what has been historically classified as Gram negative bacteria but is genetically more simialr to low G+ C Grm positive bacteria?

mycoplasmas More test answers on https://studyhippo.com/micro-11-1848/

Which has a thicker cell wall- gram positive or gram negative bacteria?

Gram positive More test answers on https://studyhippo.com/test-1-gram-pos-cocci-2756/

What color do gram negative bacteria stain?

pink More test answers on https://studyhippo.com/test-1-gram-pos-cocci-2756/

Gram negative bacteria with lipopolysaccharide layer that can be broken down and Lipid A is released

Endotoxins More test answers on https://studyhippo.com/fall-final-950/

Fimbriae & Pilli-gram negative bacteria-shorter, thinner & straighter than FLagella-used for attatchment and transfer of DNA rather then movement

Pilin= structure consisting of protein, arranged in helical around central core- divided into two types. FImbriae & pilli Fimbriae- used for attatchment-form biofilms-help bacteria stick Pilli- not MAIN role of attcmt but CONJUGATION-transfer DNA from one cell to another FImbria absent, then no disease can happen bc it cant colonize*help colonize mucous membranes (ex: gonorea) More test answers on https://studyhippo.com/micro-chapter-4-1631/

Serum sensitivity/resistance of Gram positive and Gram negative bacteria

–The complement system has the ability to kill many Gram-negative bacteria by cell lysis, using the membrane attack complex–Some pathogenic bacteria have the ability to resist complement lysisEx: Neisseriagonorrhoeae utilizes an outer membrane protein that binds to factor H, increasing the conversion of C3b to iC3b–Gram-positive bacteria are naturallyresistant to lysis by complement due to the thick peptidoglycan cell wall of these bacteria–However, Gram-positive bacteria still are opsonized by complement. More test answers on

examples of gram negative bacteria

Pseudomonas aeruginosa More test answers on https://studyhippo.com/lab-practical-4-1315/

What is present in both gram positive and gram negative bacteria?

peptidoglycan More test answers on https://studyhippo.com/final-10-996/

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Gram Negative Bacteria Flashcards, test questions and answers

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What is Gram Negative Bacteria?

Gram Negative Bacteria are a group of bacteria that have an outer cell membrane and contain lipopolysaccharides. These bacteria can be found in many different environments, such as soil, water, and the human body. Gram-negative bacteria are typically more resistant to antibiotics than Gram-positive bacteria, making them challenging to treat. Gram-negative bacteria have a unique structure that is composed of two components: an inner cytoplasmic membrane and an outer cell wall. The inner membrane is made up of fatty acids and proteins which protect the bacterial cell from environmental changes. The outer wall contains a polysaccharide layer called lipopolysaccharides (LPS). This layer creates an additional barrier against antibiotics and other toxins that the organism may encounter in its environment. Gram-negative bacteria are very diverse, with some species being beneficial while others can cause serious illnesses in humans or animals. Some examples of pathogenic Gram-negative bacteria include Escherichia coli (E. coli), Salmonella spp., Shigella spp., Klebsiella pneumoniae and Pseudomonas aeruginosa. These organisms can cause food poisoning, urinary tract infections, pneumonia, sepsis and other diseases in humans or animals when they come into contact with someone’s body mucous membranes or bloodstreams. In addition to their role as pathogens, Gram negative bacteria also play important roles in nature through processes such as nitrogen fixation (which helps plants grow) and nutrient cycling (which recycles essential elements). They also help keep harmful pathogens at bay by competing for resources in their environment and producing toxins which kill off harmful organisms. Gram negative bacteria can be identified under the microscope by using a staining technique called the Gram stain.