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Fun, engaging games to boost memory, math fluency, typing speed, and English skills—perfect for learners of all ages.
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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What do we measure using direct cell counts?
💡 Hint: Think about what methods measure all cells.
Question 2
Easy
What does CFU stand for?
💡 Hint: It relates to viable counts.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What does CFU stand for?
- Colony Forming Unit
- Cell Function Unit
- Cytoplasm Formation Utility
💡 Hint: Think about what it refers to in terms of growth.
Question 2
True or False? Turbidimetric methods only measure viable cells.
- True
- False
💡 Hint: Reflect on what turbidity indicates.
Solve and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
A biologist needs a viable count of bacteria from a sample that could have been contaminated. She plates a 10^-3 dilution and gets 300 colonies after 24 hours. Calculate the CFU/mL.
💡 Hint: Remember to consider the dilution factor.
Question 2
If a culture is measured at an optical density of 0.8 at 600 nm, what does this imply about cell density, and what further action would you take to ensure a viable count?
💡 Hint: Think about correlating OD measurements with viabilities.
Challenge and get performance evaluation