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HEK, MAC, EMB (week 5)

Authored by Kristen Gragert

Science

University

HEK, MAC, EMB (week 5)
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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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