If a population of bacteria doubles every 20 minutes, starting from 100 cells, how many cells will there be after 1 hour?

A 200

B 400

C 800

D 1600

✓ Correct Answer: Option C

1 hour = 3 doublings (0→20→40→60 min). 100 → 200 → 400 → 800.

💡 Why is C) the correct answer?

The correct answer to the question "If a population of bacteria doubles every 20 minutes, starting from 100 cells, how many cells will there be after 1 hour?" is Option C: 800.

The other options — A) 200, B) 400, D) 1600 — are incorrect for this ACT Exam Prep question. As explained above: 1 hour = 3 doublings (0→20→40→60 min). 100 → 200 → 400 → 800.

📚 About This ACT Exam Prep Practice Question

This 2-level ACT Exam Prep question from the Science topic is part of BrainForge Quiz's free exam preparation library. Each question includes the correct answer and a detailed explanation to help you understand the underlying concept, not just memorize the answer.

How to use this page: Read the question above, consider all four options (A through D), then check the highlighted correct answer and explanation. For active timed practice, start a free ACT Exam Prep practice test or use flashcards for spaced repetition review.

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If a population of bacteria doubles every 20 minutes, starting from 100 cells, how many cells will there be after 1 hour?

✓ Correct Answer: Option C

📚 About This ACT Exam Prep Practice Question

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