What is the primary purpose of MacConkey Agar in bacterial culture?
Microbiology: MacConkey Agar

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Science, Chemistry, Biology
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
To promote the growth of gram-positive bacteria
To select for gram-negative bacteria and differentiate lactose fermenters
To differentiate between aerobic and anaerobic bacteria
To identify bacterial spores
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which component in MacConkey Agar is responsible for indicating lactose fermentation?
Lactate dehydrogenase
pH indicator
Crystal violet
Bile salts
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What are the monosaccharides produced from the hydrolysis of lactose?
Fructose and sucrose
Glucose and galactose
Maltose and ribose
Lactose and sucrose
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which enzyme converts pyruvate into lactic acid during lactose fermentation?
Lactate dehydrogenase
Beta-galactosidase
Amylase
Protease
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How can you identify non-lactose fermenting colonies on MacConkey Agar?
They turn the agar black
They produce a green sheen
They appear colorless or pale
They appear hot pink
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