Question

Which one of the following is wrongly matched?

• A. Operon—Structural genes, operator and promoter
• B. Repressor protein—Binds to operator to stop enzyme synthesis
• C. Transcription—Writing information from DNA to proteins
• D. Translation—Using information in mRNA to make protein

Answer 1

The correct option is C Transcription—Writing information from DNA to proteins

Operon
Operon is a cluster of structural genes which have a common promoter along with the associated regulatory gene which has its own promoter. The structural genes are transcribed as a single polycistronic mRNA.
Transcription
Transcription is the process of synthesising RNA by using the DNA as a template. Here, the information is passed from DNA to RNA.
Translation
The process of synthesising a polypeptide chain based on the information in mRNA (codon) is called translation.
Repressor protein
In lac operon, the lac i gene codes for a repressor protein that binds to the operator gene to switch off the operon. This is called negative control.
Final answer
(B) Transcription—Writing information from DNA to protein