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Microbiology

Explore the tiny organisms that shape bodies, ecosystems, and change.

Follow the mechanism1 / 3

Microbes encounter a condition. Nutrients, temperature, oxygen, pH, and stress determine whether a microbial cell can invest energy in growth and division.

microbial growthexponential · 46 relative cells

Focus the idea

phaseexponential

population46

capacity71

doubling time1.2 h

Starting population 12Growth rate 68%Resource supply 72%Environmental stress 18%Time 45%

The culture is in exponential: resources set the carrying capacity while the effective rate controls how quickly the population approaches it.

This is a population-level model of one microbial group: a smooth lag ramp, logistic growth toward a resource-set capacity, and net death when stress outweighs division (growth rate 0 means no division). Phases are read from the curve's per-capita slope. Real communities include species interactions, spatial structure, mutation, horizontal gene transfer, and changing environments.

04 / PRACTICE

Make the biology yours.

0 / 3 checked

Answer from the model, then use the explanation to connect the visual mechanism to the biological rule.

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Microbiology

Make the biology yours.

What produces exponential growth in the simplest model?