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Biology LibreTexts

Lab 3: Worksheet

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Name: ______________________________

Section: _____________________________

Student ID#:__________________________

Work in groups on these problems. You should try to answer the questions without referring to your textbook. If you get stuck, try asking another group for help.

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1. Why are S. epidermidis and P. aeruginosa the same color with the simple stain? (1)

2. What is being stained in a negative stain? (1)

3. How does the charge of bacterial cells impact the staining procedures used? (1)

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4. Which plate had gram-negative bacteria? What color were these bacteria and why? (2)

5. Which plate had gram-positive bacteria? What color were they and why? (2)

6. Draw the membrane layers of a gram-positive and gram-negative bacteria making sure to label the plasma membrane, peptidoglycan layers, periplasmic space, and LPS (3)


This page titled Lab 3: Worksheet is shared under a CC BY-SA license and was authored, remixed, and/or curated by Nazzy Pakpour & Sharon Horgan.

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