Laboratory Report 15 15 Gram Staining A. Results cells from the Gram-stained sli
ID: 196044 • Letter: L
Question
Laboratory Report 15 15 Gram Staining A. Results cells from the Gram-stained slides. and label each bacterial species. Based on your results, note the Draw Gram reaction, cell shape, and cell arrangement of each bacterium in the given table. Verify these results to determine if you are correct P. aeruginosa and S. aureus B, megaterium and E. coli M. catarrhalis BACTERIAL SPECIES Bocillus megaterlum Moraxe/la catarrhalls B. Short-Answer Questions 1. Why is the Gram stain considered a differential stain? 2. How do gram-positive and gram-negative bacteria differ in cellular structure, and how does this con- tribute to their differential staining properties 3. How does the age of a culture affect the Gram stain reaction? What is an optimum culture age for a Gram reaction?Explanation / Answer
BACTERIAL SPECIES GRAM REACTION CELL SHAPE CELL ARRANGEMENT Staphyloccocus aureus Gram Positive Rounded (coccus) Bunch of grape like arrangement Pseudomonas auroginosa Gram Negative Rod shaped (Bacillus) As chains (streptobacillus) Bacillus megatirerium Gram Positive Rod shaped (bacillus) streptobacillus, mono bacillus or diplobacillus. E. Coli. Gram negative Rod shaped (bacillus) single (monobacillus) Moroxella cataharalis Gram negative Spherical (coccus) diplococcus
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