Difference Between Gram Positive & Negative Bacteria


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question 1 of 3

Bacteria will stain differently based on their:

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1. Bacterial cell walls are unique because they contain _____, which is a woven structure of sugars and proteins.

2. _____ bacteria have a thick, outer layer of peptidoglycan and stain purple.

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About This Quiz & Worksheet

How can scientists know that bacteria is different from one another? This quiz/worksheet combo will help you test your knowledge of the difference between gram positive and gram negative bacteria and how scientists distinguish between the two. The quiz questions will test you on why gram negative bacteria are more resistant to medicine and what type of bacteria E. Coli and Salmonella are examples of.

Quiz & Worksheet Goals

These assessments will test you on the following:

  • Reason bacteria will stain differently
  • The structure of bacterial cell walls
  • Type of bacteria with a thick, outer layer of peptidoglycan and stains purple

Skills Practiced

This quiz and worksheet allow students to use the following skills:

  • Reading comprehension - ensure that you draw the most important information from the related lesson regarding two types of bacteria
  • Interpreting information - verify that you can read and correctly interpret information regarding what causes bacteria to stain differently
  • Information recall - access the knowledge you've gained regarding gram negative bacteria's resistance to medicine
  • Knowledge application - use your knowledge to answer questions about E. Coli and Salmonella

Additional Learning

To learn more about distinguishing between bacteria, review the accompanying lesson, Difference Between Gram Positive & Negative Bacteria. The lesson covers the following objectives:

  • Define gram staining
  • Differentiate between the structure of gram positive and gram negative bacteria
  • Identify how the bacteria appear under a microscope