Homework Help is Here – Start Your Trial Now!
Science
Biology
MacConkey lactose agar is a medium that kills all microbes except for gram-negative bacteria, and it contains dyes that turn deep purple if a microbe grows and ferments lactose. MacConkey lactose agar is which sort of medium? Selective and differential Selective Differential

MacConkey lactose agar is a medium that kills all microbes except for gram-negative bacteria, and it contains dyes that turn deep purple if a microbe grows and ferments lactose. MacConkey lactose agar is which sort of medium? Selective and differential Selective Differential

Human Anatomy & Physiology (11th Edition)
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,...
See similar textbooks
icon
Related questions
Question
**Understanding MacConkey Lactose Agar** **Question:** MacConkey lactose agar is a medium that kills all microbes except for gram-negative bacteria, and it contains dyes that turn deep purple if a microbe grows and ferments lactose. MacConkey lactose agar is which sort of medium? **Options:** 1. Selective and differential 2. Selective 3. Differential (An option labeled "Selective" is marked indicating that it was the selected answer.) **Explanation:** MacConkey lactose agar serves important functions in microbiology for identifying and differentiating between microorganisms. It is especially useful in identifying bacteria from the Enterobacteriaceae family, which includes many significant pathogens. 1. **Selective Aspect:** - MacConkey agar contains bile salts and crystal violet which inhibit the growth of gram-positive bacteria. This allows for the selective growth of gram-negative bacteria. 2. **Differential Aspect:** - It contains lactose and neutral red as a pH indicator. Bacteria that ferment lactose produce acid which lowers the pH and changes the color of the colonies to deep purple/red. Non-lactose fermenting bacteria will remain colorless or have no change in color. Therefore, despite the selected answer being "Selective", MacConkey lactose agar is actually both selective and differential due to its capacity to both inhibit certain bacteria and visually differentiate between lactose fermenters and non-fermenters. For further clarification and visual understanding, resources such as illustrations or videos demonstrating bacterial growth on MacConkey agar can be highly beneficial.
Transcribed Image Text:**Understanding MacConkey Lactose Agar** **Question:** MacConkey lactose agar is a medium that kills all microbes except for gram-negative bacteria, and it contains dyes that turn deep purple if a microbe grows and ferments lactose. MacConkey lactose agar is which sort of medium? **Options:** 1. Selective and differential 2. Selective 3. Differential (An option labeled "Selective" is marked indicating that it was the selected answer.) **Explanation:** MacConkey lactose agar serves important functions in microbiology for identifying and differentiating between microorganisms. It is especially useful in identifying bacteria from the Enterobacteriaceae family, which includes many significant pathogens. 1. **Selective Aspect:** - MacConkey agar contains bile salts and crystal violet which inhibit the growth of gram-positive bacteria. This allows for the selective growth of gram-negative bacteria. 2. **Differential Aspect:** - It contains lactose and neutral red as a pH indicator. Bacteria that ferment lactose produce acid which lowers the pH and changes the color of the colonies to deep purple/red. Non-lactose fermenting bacteria will remain colorless or have no change in color. Therefore, despite the selected answer being "Selective", MacConkey lactose agar is actually both selective and differential due to its capacity to both inhibit certain bacteria and visually differentiate between lactose fermenters and non-fermenters. For further clarification and visual understanding, resources such as illustrations or videos demonstrating bacterial growth on MacConkey agar can be highly beneficial.
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 3 steps

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Knowledge Booster
Microbial culture
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
Biology
ISBN:
9780134580999
Author:
Elaine N. Marieb, Katja N. Hoehn
Publisher:
PEARSON
Biology 2e
Biology 2e
Biology
ISBN:
9781947172517
Author:
Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:
OpenStax
Anatomy & Physiology
Anatomy & Physiology
Biology
ISBN:
9781259398629
Author:
McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa Stouter
Publisher:
Mcgraw Hill Education,
Molecular Biology of the Cell (Sixth Edition)
Molecular Biology of the Cell (Sixth Edition)
Biology
ISBN:
9780815344322
Author:
Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter Walter
Publisher:
W. W. Norton & Company
Laboratory Manual For Human Anatomy & Physiology
Laboratory Manual For Human Anatomy & Physiology
Biology
ISBN:
9781260159363
Author:
Martin, Terry R., Prentice-craver, Cynthia
Publisher:
McGraw-Hill Publishing Co.
Inquiry Into Life (16th Edition)
Inquiry Into Life (16th Edition)
Biology
ISBN:
9781260231700
Author:
Sylvia S. Mader, Michael Windelspecht
Publisher:
McGraw Hill Education
SEE MORE TEXTBOOKS