2
Question
Control of gene expression in prokaryotes take place at the level of:
Control of gene expression in prokaryotes take place at the level of:
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Solution
The correct option is C Transcription
Gene expression:
The process by which the information encoded in a gene is used for directing the synthesis of a protein molecule is called gene expression.
Transcription:
Transcription refers to the process of copying information from one strand of DNA into RNA.
In both prokaryotes and eukaryotes, gene expression can be controlled at the transcription level by preventing the RNA polymerase from binding to the promoter site. This can be done using a repressor.
Translation:
Translation refers to the process of polymerisation of amino acids to form a polypeptide.
In prokaryotes, gene expression cannot be controlled at the translation level because transcription and translation takes place simultaneously.
In eukaryotes, gene expression can be controlled at translation level. This is because transcription occurs in the nucleus and translation occurs in the cytoplasm. So by preventing the transport of mRNA into the cytoplasm, gene expression can be controlled. But unnecessarily energy is wasted in creating an RNA in this mechanism. So the preferred method is controlling gene expression at the transcription level.
DNA replication:
DNA replication is the process by which a double-stranded DNA molecule is copied to produce two identical daughter DNA molecules.It is not part of gene expression.
Final answer: b. Transcription
Gene expression:
The process by which the information encoded in a gene is used for directing the synthesis of a protein molecule is called gene expression.
Transcription:
Transcription refers to the process of copying information from one strand of DNA into RNA.
In both prokaryotes and eukaryotes, gene expression can be controlled at the transcription level by preventing the RNA polymerase from binding to the promoter site. This can be done using a repressor.
Translation:
Translation refers to the process of polymerisation of amino acids to form a polypeptide.
In prokaryotes, gene expression cannot be controlled at the translation level because transcription and translation takes place simultaneously.
In eukaryotes, gene expression can be controlled at translation level. This is because transcription occurs in the nucleus and translation occurs in the cytoplasm. So by preventing the transport of mRNA into the cytoplasm, gene expression can be controlled. But unnecessarily energy is wasted in creating an RNA in this mechanism. So the preferred method is controlling gene expression at the transcription level.
DNA replication:
DNA replication is the process by which a double-stranded DNA molecule is copied to produce two identical daughter DNA molecules.It is not part of gene expression.
Final answer: b. Transcription
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