Why do prokaryotes need to be able to regulate their metabolism quickly?

Prokaryotes are organisms made up of single cell only. The cellular processes are not much complex because the energy input would increase then. Prokaryotes spend energy judiciously as the source of nutrition is very limited. The main aim is to reproduce or survive adverse conditions. That's why prokaryotes regulate the metabolism quickly.

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in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation: