You are performing a Gram stain on gram-positive bacteria and you stop after the addition of the first dye. What is the appearance of the bacteria at this point?Question 13Answera.purpleb.colorlessc.redd.brown

You are performing a Gram stain on gram-negative bacteria and you stop after the decolorizer step. What is the appearance of the bacteria at this point?Question 11Answera.redb.colorlessc.purpled.brownClear my choice

Gram staining involves three steps: 1. crystal violet (purple) staining, 2. decolorization, 3. counterstaining (red). If you look under a microscope after the first step, you will see that:Group of answer choicesonly gram negative bacteria are purpleonly gram positive bacteria are purpleboth gram positive and negative bacteria are purpleneither gram positive and negative bacteria are purple

Gram staining is based on:a) the ability of the bacterial cell wall to retain crystal violet dyeb) the lysis of bacterial cellsc) differences in bacterial shape and sized) growth of bacterial cells

Identify the characteristic that is found in Gram-positive bacteria.Multiple Choicestains pink / red with the Gram staina thick peptidoglycan layer in their cell walla thin cell wallan outer membrane composed of lipopolysaccharide

The Gram’s stain used for bacterial staining isSelect an answerAsafranin and iodineBcrystal violet and cotton blueCcotton blue and iodineDcrystal violet and iodine