What are the parts of an operon?

An operon consists of an operator, promoter, regulator, and structural genes. The regulator gene codes for a repressor protein that binds to the operator, obstructing the promoter  of the structural genes. The regulator does not have to be adjacent to other genes in the operon.

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An operon consists of an operator, promoter, regulator, and structural genes.

Explanation:

Promoter – a nucleotide sequence that enables a gene to be transcribed. The promoter is recognized by RNA polymerase, which then initiates transcription. Operator – a segment of DNA to which a repressor binds.

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the index of refraction of the second medium is higher. i just took the test trust me !

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.