Q. What is the optimal pH range for most bacteria to grow?
-
A.
1-3
-
B.
4-6
-
C.
6-8
-
D.
9-11
Solution
Most bacteria grow optimally in a pH range of 6-8.
Correct Answer:
C
— 6-8
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Q. What is the primary source of energy for most bacteria during growth?
-
A.
Light
-
B.
Organic compounds
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C.
Inorganic compounds
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D.
Nucleic acids
Solution
Most bacteria utilize organic compounds as their primary source of energy during growth.
Correct Answer:
B
— Organic compounds
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Q. What is the term for bacteria that can grow in the absence of oxygen?
-
A.
Aerobes
-
B.
Anaerobes
-
C.
Facultative anaerobes
-
D.
Microaerophiles
Solution
Anaerobes are bacteria that can grow in the absence of oxygen.
Correct Answer:
B
— Anaerobes
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Q. What is the term for bacteria that thrive in high salt concentrations?
-
A.
Mesophiles
-
B.
Halophiles
-
C.
Psychrophiles
-
D.
Thermophiles
Solution
Halophiles are bacteria that thrive in high salt concentrations.
Correct Answer:
B
— Halophiles
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Q. What type of medium is used to grow bacteria that require specific nutrients?
-
A.
Selective medium
-
B.
Differential medium
-
C.
Enriched medium
-
D.
Agar medium
Solution
Enriched media are used to grow bacteria that require specific nutrients that are not present in standard media.
Correct Answer:
C
— Enriched medium
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Q. Which nutrient is crucial for the synthesis of nucleic acids in bacteria?
-
A.
Glucose
-
B.
Nitrogen
-
C.
Phosphorus
-
D.
Sulfur
Solution
Phosphorus is crucial for the synthesis of nucleic acids in bacteria.
Correct Answer:
C
— Phosphorus
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Q. Which of the following factors does NOT affect bacterial growth?
-
A.
Temperature
-
B.
pH
-
C.
Oxygen concentration
-
D.
Color of the medium
Solution
The color of the medium does not affect bacterial growth, while temperature, pH, and oxygen concentration are critical factors.
Correct Answer:
D
— Color of the medium
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Q. Which of the following is a common carbon source for bacterial growth?
-
A.
Glucose
-
B.
Sodium chloride
-
C.
Calcium carbonate
-
D.
Ammonium sulfate
Solution
Glucose is a common carbon source for bacterial growth.
Correct Answer:
A
— Glucose
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Q. Which of the following is NOT a macronutrient essential for bacterial growth?
-
A.
Carbon
-
B.
Nitrogen
-
C.
Phosphorus
-
D.
Zinc
Solution
Zinc is a micronutrient, while carbon, nitrogen, and phosphorus are macronutrients essential for bacterial growth.
Correct Answer:
D
— Zinc
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Q. Which vitamin is essential for the growth of certain bacteria and is often added to culture media?
-
A.
Vitamin A
-
B.
Vitamin C
-
C.
Vitamin B12
-
D.
Vitamin D
Solution
Vitamin B12 is essential for the growth of certain bacteria and is often added to culture media.
Correct Answer:
C
— Vitamin B12
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