In the model of the lesson, a culture levels off at 1000 million cells in every millilitre, and the…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
In the model of the lesson, a culture levels off at million cells in every millilitre, and the rate of growth is per hour. The time to reach half of the limit is , where is the start in million cells in every millilitre.
- After how many hours does a culture that starts with million reach million?
- After how many hours does a culture that starts with million reach million?
- How many hours sooner is the second culture?
Need a reminder? The key ideaShow
A batch culture has a lag phase, a log phase, a stationary phase and a decline phase. In the log phase the number doubles at a steady pace, . A recombinant protein comes from a gene that is expressed in a host of another species.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. Limit , rate per hour.
Plan. Use for each start.
Step 1. (a) . Then h.
Step 2. (b) . Then h.
Step 3. (c) h.
Answer: h; h; h sooner.
Check. A larger start leaves less to grow, so it takes less time to reach half of the limit.
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