1. Match the expected result (purple, red, or colorless) to the following descri

Question

1. Match the expected result (purple, red, or colorless) to the following descriptions of Gram-stained cells. Consult your chart at the beginning of this lab report if you need help remembering the correct Gram reaction for each species. Choices may be used more than once. (5pts)

a. Staphylococcus aureus before the primary stain________

b. Pseudomonas aeruginosa after the primary stain __________

c. Bacillus megaterium after the addition of the mordant ____________

d. Staphylococcus aureus after decolorization _________________

e. Moraxella catarrhalis after decolorization_____________

f. Pseudomonas aeruginosa after decolorization_____________

g. Bacillus megaterium after adding the counterstain___________

h. Escherichia coli under the microscope if you forgot to apply safranin___________

i. Escherichia coli under the microscope if you forgot to apply decolorizer__________

j. Bacillus megaterium under the microscope if you forgot to apply iodine__________

A= Purple

B= Red

C= Colorless

Explanation / Answer

Answer:

Match the expected result (purple, red, or colorless) to the following descriptions of Gram-stained cells.

The expected results based on the gram stain procedure and microorganism features are:

a. Staphylococcus aureus before the primary stain C) Colorless

b. Pseudomonas aeruginosa after the primary stain A) Purple

c. Bacillus megaterium after the addition of the mordant A) Purple

d. Staphylococcus aureus after decolorization A) Purple

e. Moraxella catarrhalis after decolorization C) Colorless

f. Pseudomonas aeruginosa after decolorization C) Colorless

g. Bacillus megaterium after adding the counterstain A) Purple

h. Escherichia coli under the microscope if you forgot to apply safranin C) Colorless

i. Escherichia coli under the microscope if you forgot to apply decolorizer A) Purple

j. Bacillus megaterium under the microscope if you forgot to apply iodine B) Red

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