The Gram reaction is used to classify bacteria into two broad categories, Gram positive and Gram negative. The Gram stain characteristics of a bacterium depends on its cell wall components and thickness. The viruses do not have any cell walls or other equivalent. The viruses are too small to be seen by light microscopy, only exception is the Pox virus. So the Gram stain is not appropriate for virus identification. However, if one is able to see papilloma virus through light microscope, these may appear Gram negative. Because the crystal violet dye would be removed by decolorizer, and the counterstain (safranin or carbol fuchsin) would show its color.
Whar are the gram reaction of mycobacterium?Type your answer here...
what are some of the reasons for a gram-variable reaction
It is gram-positive.
Chlamydia trachomatis is coccoid and gram negative.
if you don't establish gram staining reaction and morphology in the identification of the bacterial isolate, you won't know the gram staining reaction properties and morphology identities of the bacterial isolate.
Streptococcus pyogenes is gram positive bacteria.
Human cells are Gram-negative because they do not contain certain structures. More simply, if they don't have a cell wall they cannot be Gram-positive.
Genetics, Age of culture, type of growth medium, and technique used could result in a gram-variable reaction
It might cause reaction in staining and cause accident
Yes. It would stain gram negative. The gram stain was actually originally used to distinguish between baterial cells and human cells.
the Gram reaction is based on the structure of the bacterial cell wall. In Gram-positive bacteria, the dark purple crystal violet stain is retained by the thick layer of peptidoglycan which forms the outer layer of the cell. In Gram-negative bacteria, the thin peptidoglycan layer in the periplasm does not retain the dark stain, and the pink safranin counter stain stains the peptidoglycan layer. In other word,the gram reaction refers to how the cells reacts to the gram-staining process.
no human cells are gram negative, as they dont have a cell wall to retain the crystal violet,and so appear pink when seen under microscope,and thus are gram negative.
the important factor which effect gram stain reactions is reaction time i.e. if the timing of dyes to be implied like meythlene blue and also timing of iodine expousre effects straining procedure then it comes to the concentraion of dyes which effect gram stain reaction
the delay in response needed from a human due to his/hers reaction time.
Human cells have no cell walls, only a plasma membrane, and as a result lack the peptidoglycan layer that gram stains utilize to differentiate between gram negative and gram positive species of bacteria. Therefore, human cells are unable to retain the crystal violet introduced in the first step of the gram stain, and stain negative. (they appear pinkish like gram-negative bacteria)
There are a number of factors that affect human reaction rates. Temperature is one major factor that affects human reaction rates for example.
Biologists separate bacteria into two groups based on their reaction with the gram stain as Gram Positive and Gram Negative bacteria.