What is the main goal of isolating a pure culture?
A
To grow multiple species together B
To avoid using culture media C
To study a single type of microorganism D
To increase contamination
Analysis & Theory
Pure cultures allow scientists to study one microorganism without interference.
Which method is commonly used to isolate individual colonies on agar?
A
Streak plate method B
Microscopic method C
Gram staining D
Wet mount
Analysis & Theory
The streak plate method spreads bacteria over the agar to isolate colonies.
In which method do colonies grow inside and on the surface of agar?
A
Streak plate B
Pour plate C
Spread plate D
Dip slide
Analysis & Theory
In the pour plate method, diluted sample is mixed with molten agar and poured into a dish.
Why is a pure culture necessary for antibiotic sensitivity testing?
A
To increase resistance B
To ensure accurate results C
To grow viruses D
To identify contamination
Analysis & Theory
Mixed cultures give misleading results; only pure cultures provide correct antibiotic response.
Which tool is used in the streak plate method?
A
Pipette B
Glass rod C
Inoculation loop D
Filter paper
Analysis & Theory
An inoculation loop spreads bacteria on the agar surface in the streak plate method.