Bacterial production of the enzymes needed for the synthesis of the amino acid tryptophan declines with increasing levels of tryptophan and increases as tryptophan levels decline. This is an example of

repressible operon

Explanation:

As tryptophan level increases in the bacteria growth media, the operator region of the operon is blocked to inhibit the functional gene responsible for the synthesis of enzymes that synthesize tryptophan. When tryptophan level decreases, the operator regiintis unblocked to allow synthesis of the enzyme.. This is known as a repressible operon

succession returns a disturbed

ecosystem to a more stable state. this is also classified into two (2) types:

primary succession and secondary succession. the primary succession arises when

a new land is transformed and a bare rock has been exposed providing an environment

that can be occupied for the first time. while, secondary succession occurs

when a previously occupied environment was disturbed that kills much of all its

community

explanation:

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