In Gram staining, gram- cells are purple whereas gram- cells appear pink/red.
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Step 1: Gram-positive bacteria have a thick peptidoglycan layer in their cell wall. Show more…
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Select ALL the correct options from the list below: Gram-negative bacteria appear purple when viewed under microscope. Gram-positive bacteria appear pink when viewed under microscope after Gram staining. Gram-negative bacteria appear green when viewed under microscope after Gram staining. Gram-positive bacteria have a complex cell wall that contains only a small layer of peptidoglycan. Gram-negative bacteria have a simple cell wall that contains a large layer of peptidoglycan. Gram-positive bacteria are always spherical in shape, known as cocci. Gram-negative bacteria are always rod-shaped, known as bacilli. Gram-positive bacteria are able to be identified using the differential staining technique known as Gram stain. Gram-negative bacteria are able to be identified using a simple staining technique using crystal violet.
Shaiju T.
Following the addition of Gram's iodine and prior to adding acetone, what is the color of Gram-negative and Gram-positive bacteria? Gram-positive and Gram-negative are pink/red. Gram-positive will be purple and Gram-negative pink. Gram-positive is purple and Gram-negative is clear. None of the answers are correct. Gram-positive and Gram-negative are purple.
Adi S.
The Gram stain technique is used to differentiate bacteria based on the biochemical composition and structure of their cell wall. After staining, Gram-positive bacteria appear purple and Gram-negative bacteria appear pink. Identifying an unknown bacterial sample as Gram-negative or Gram-positive tells the investigator a good deal about the structure of the bacterial cell envelope. In clinical settings, knowing whether a patient is suffering from a Gram-negative or Gram-positive infection will influence the selection of antibiotics used to treat the infection. Observe these colonies of four species of common bacteria and try to classify them based on what you can see regarding their shape and color.
Madhur L.
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