HEK, MAC, EMB (week 5)
Quiz
•
Science
•
University
•
Practice Problem
•
Hard
Kristen Gragert
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28 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which type of organisms can be differentiated from each other using the HEK media?
Spore-forming gram-positive bacilli
Non-spore-forming gram-negative bacilli
Lactose-fermenting gram-positive cocci
Non-lactose-fermenting gram-positive rods
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What was the significant contribution of MacConkey agar?
It inhibited all bacterial growth
It allowed identification of pathogenic enteric bacteria by lack of lactose fermentation
It enhanced the growth of gram-positive bacteria
It was the first media to use antibiotics
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which genera did EMB media allow a visual distinction between?
Bacillus and Clostridium
Escherichia coli and Salmonella
Staphylococcus and Streptococcus
Lactobacillus and Bifidobacterium
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary purpose of Hektoen enteric agar?
To recover gastrointestinal pathogens like Salmonella and Shigella
To enhance the growth of all bacteria
To inhibit the growth of all pathogens
To recover only nonpathogenic bacteria
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How does Hektoen enteric agar differentiate between pathogenic and nonpathogenic coliforms?
By color change due to acid production
By size of the colonies
By smell of the colonies
By the speed of growth
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What color do colonies appear on Hektoen enteric agar if they are able to ferment lactose, sucrose, or salicin?
Greenish blue
Bright red
Salmon-pink to orange-yellow
Dark purple
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the role of bile salts in Hektoen enteric agar?
To enhance the growth of all bacteria
To inhibit most gram-positive organisms
To provide nutrients for bacteria
To change the color of the medium
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