A culture of plant cells weighs 3 g. It doubles its weight every 4 days, and it is in its log phase…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A culture of plant cells weighs . It doubles its weight every days, and it is in its log phase.
- What does it weigh after days?
- What does it weigh after days?
- Find its relative growth rate , from , using .
Need a reminder? The key ideaShow
Arithmetic growth: , a straight line. Geometric growth: , a sigmoid curve with a lag, a log and a stationary phase. Absolute growth rate is the total gain in a unit of time. Relative growth rate is the gain per unit of the starting size. A part that doubles in a time has . Growth needs water, oxygen, nutrients and a suitable temperature.
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.
Step 1. Eight days. That is doublings. .
Step 2. Twelve days. That is doublings. .
Step 3. The rate. In days the weight doubles, so . Then , so per day.
Answer: ; ; per day.
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