Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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
Transcribed Image Text:**Image Transcription for Educational Website: MacConkey Agar Results**
**Instructions:** Complete the below chart based on the image of a MacConkey agar plate.
**Colony Color:**
- Pink/red
**Lactose Fermentation + or -:**
- Positive (+)
**Explanation:**
The MacConkey agar plate shown in the image displays bacterial colonies that are primarily pink to red in color. This coloration indicates that the bacteria present are capable of fermenting lactose. MacConkey agar is a selective and differential culture medium designed to isolate gram-negative enteric bacteria and differentiate them based on lactose fermentation. Lactose fermenters, such as Escherichia coli, produce acid from lactose, leading to a pink/red coloration of the colonies, while non-fermenters remain colorless or appear pale.
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