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Questions and Answers
How many microscope fields are typically counted in the Petroff-Hausser slide method?
How many microscope fields are typically counted in the Petroff-Hausser slide method?
- 5
- 12
- 8
- 10 (correct)
What is the main disadvantage of using the Petroff-Hausser slide for direct microscopic counting?
What is the main disadvantage of using the Petroff-Hausser slide for direct microscopic counting?
- The slide does not provide accurate measurements of microorganisms.
- It cannot distinguish between living and dead cells during counting. (correct)
- The counting area is too small for accurate counting.
- The slide requires complex staining techniques.
In the Breed method, bacteria are counted in at least how many different areas under the microscope?
In the Breed method, bacteria are counted in at least how many different areas under the microscope?
- 8
- 5
- 10 (correct)
- 12
What is the basis for counting in the Thoma slide method?
What is the basis for counting in the Thoma slide method?
What is the final result obtained by the counting method with the Thoma slide?
What is the final result obtained by the counting method with the Thoma slide?
Which method is most suitable for determining the amount of long filament bacteria?
Which method is most suitable for determining the amount of long filament bacteria?
Why are direct microscopic counting methods not suitable for samples containing low concentrations of microorganisms?
Why are direct microscopic counting methods not suitable for samples containing low concentrations of microorganisms?
What is the disadvantage of direct microscopic counting methods?
What is the disadvantage of direct microscopic counting methods?
What must be done prior to counting motile cells using direct microscopic counting methods?
What must be done prior to counting motile cells using direct microscopic counting methods?
Which method is suitable for determining the amount of single-celled organisms such as bacteria and yeasts?
Which method is suitable for determining the amount of single-celled organisms such as bacteria and yeasts?
What is the main disadvantage of direct microscopic counting methods for determining the total cell number?
What is the main disadvantage of direct microscopic counting methods for determining the total cell number?
Which method is most suitable for determining the amount of long filament bacteria?
Which method is most suitable for determining the amount of long filament bacteria?
What must be done prior to counting motile cells using direct microscopic counting methods?
What must be done prior to counting motile cells using direct microscopic counting methods?
In the Breed method, bacteria are counted in at least how many different areas under the microscope?
In the Breed method, bacteria are counted in at least how many different areas under the microscope?
Why are direct microscopic counting methods not suitable for samples containing low concentrations of microorganisms?
Why are direct microscopic counting methods not suitable for samples containing low concentrations of microorganisms?
What is the main disadvantage of using the Breed method for direct microscopic counting?
What is the main disadvantage of using the Breed method for direct microscopic counting?
In the Thoma slide method, the counting area is divided into how many large squares?
In the Thoma slide method, the counting area is divided into how many large squares?
What is the basis for counting in the Petroff-Hausser slide method?
What is the basis for counting in the Petroff-Hausser slide method?
What is the advantage of using the Thoma slide method for counting blood, sperm, and yeast?
What is the advantage of using the Thoma slide method for counting blood, sperm, and yeast?
Why are direct microscopic counting methods not as accurate as culture methods in measuring all dead or live cells?
Why are direct microscopic counting methods not as accurate as culture methods in measuring all dead or live cells?
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