This virtual lab features an interactive simulation that teaches students how to conduct a gram stain. The simulation explains in detail the equipment and steps necessary to collect and gram stain a bacterial culture in a lab and includes information on how to interpret the results. This site could be used as a pre-lab activity, as an alternative to a gram stain lab, or assigned as homework. It is most appropriate for AP Bio classes or lower level undergraduate biology courses.
Type of Material:
Animation.
Recommended Uses:
As an in-class pre-lab activity, as a lab alternative, as homework
Technical Requirements:
Adobe Flash. Browser.
Identify Major Learning Goals:
To learn how to gram stain a sample of bacteria.
To learn the appropriate use of lab equipment.
Target Student Population:
AP Biology courses, lower level undergraduate biology courses
Prerequisite Knowledge or Skills:
Basic biology knowledge useful.
Content Quality
Rating:
Strengths:
Explains the process of Gram staining in a straightforward way
The animation includes actual photos of the lab technique
Some parts of the animation have additional information pop up windows
Concerns:
There are some errors of pronunciation
A few factual errors are present in the animation (confusing cell membrane with cell wall, e.g.)
The level of the explanation is low (not college)
Potential Effectiveness as a Teaching Tool
Rating:
Strengths:
Some of the animation is interactive
Allows an interactive review of the process by the user after the explanation
Has audio as well as images
The description of the four chemicals and the order in which they are used is effective as an explanation of the technique
All the equipment used is clearly labeled and easy to identify.
A thorogh explanation is given at each step.
Concerns:
Much of the interactivity is "busy work" and serves no didactic function
No questions are asked during the animation
The implications of the technique are not explained--why Gram-negative bacteria are undesirable and could be harmful, for example
Does not provide learning objectives.
Ease of Use for Both Students and Faculty
Rating:
Strengths:
Easy to use and navigate.
Engaging and interactive.
Self-contained with clear instructions.
Includes audio narration.
Concerns:
No back button is available to review steps - the simulation must proceed from beginning to end.
Creative Commons:
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