A) cistron
B) recon
C) operon
D) muton.
Correct Answer: C
Solution :
: Operon is a group of genes which regulates the gene activity by switching on and switching off some of the genes. These are the regulated unit of genetic material. An operon contains operator gene, regulator gene, represser, structural genes and promoter gene. In operon concept, the operator gene combines with regulator protein to switch off structural gene transcription. Regulator gene functions as represser and controls chemical synthesis by inhibiting transcription of mRNA. Cistron is a segment of DNA consisting of a stretch of base sequences that codes for one polypeptide chain (protein), one\[tRNA,\text{ }rRNA\]molecule or performs any other specific function like transcription and controlling of other cistrons.
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