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lac +, lactose fermenting, possibly E. coli_ [ Choose ] [Choose ] lac -, can't ferment lactose, possibly Salmonella_ or _Shigella_ A B indicator of fecal contamination of food, [Choose ] water

lac +, lactose fermenting, possibly E. coli_ [ Choose ] [Choose ] lac -, can't ferment lactose, possibly Salmonella_ or _Shigella_ A B indicator of fecal contamination of food, [Choose ] water

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,...
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**MacConkey Agar Experiment with Bacteria A and B** In this educational demonstration, MacConkey agar has been inoculated with two distinct bacteria, labeled as A and B. The objective is to match each labeled bacterium with its correct description based on their growth characteristics on the agar. **Explanation of the Image:** The image depicts a MacConkey agar plate divided into two sections, each labeled accordingly: - **Section A**: - This section shows the formation of numerous red or pink colonies. This indicates that Bacterium A is likely a lactose fermenter. Lactose fermenters produce acid, leading to a color change in the pH indicator within the agar, resulting in the red or pink coloration. - **Section B**: - This section displays growth that is not pigmented, presenting a clear or tan appearance. This suggests that Bacterium B is likely a non-lactose fermenter. Non-lactose fermenters do not produce an acidic environment, hence no color change occurs in the medium. **Instruction:** Match each labeled bacterium with its correct description of lactose fermentation capability based on the color changes observed in the MacConkey agar.
Transcribed Image Text:**MacConkey Agar Experiment with Bacteria A and B** In this educational demonstration, MacConkey agar has been inoculated with two distinct bacteria, labeled as A and B. The objective is to match each labeled bacterium with its correct description based on their growth characteristics on the agar. **Explanation of the Image:** The image depicts a MacConkey agar plate divided into two sections, each labeled accordingly: - **Section A**: - This section shows the formation of numerous red or pink colonies. This indicates that Bacterium A is likely a lactose fermenter. Lactose fermenters produce acid, leading to a color change in the pH indicator within the agar, resulting in the red or pink coloration. - **Section B**: - This section displays growth that is not pigmented, presenting a clear or tan appearance. This suggests that Bacterium B is likely a non-lactose fermenter. Non-lactose fermenters do not produce an acidic environment, hence no color change occurs in the medium. **Instruction:** Match each labeled bacterium with its correct description of lactose fermentation capability based on the color changes observed in the MacConkey agar.
**Microbiology Quiz Question** This segment presents a multiple-choice question related to bacterial lactose fermentation characteristics: 1. **lac +, lactose fermenting, possibly _E. coli_** - Options: - A - B 2. **lac -, can't ferment lactose, possibly _Salmonella_ or _Shigella_** - Options: - A - B 3. **Indicator of fecal contamination of food, water** - Options: - A - B This question assesses knowledge about bacterial properties and their implications in food and water safety.
Transcribed Image Text:**Microbiology Quiz Question** This segment presents a multiple-choice question related to bacterial lactose fermentation characteristics: 1. **lac +, lactose fermenting, possibly _E. coli_** - Options: - A - B 2. **lac -, can't ferment lactose, possibly _Salmonella_ or _Shigella_** - Options: - A - B 3. **Indicator of fecal contamination of food, water** - Options: - A - B This question assesses knowledge about bacterial properties and their implications in food and water safety.
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