Folding Step

By admin  

Which of the following is an example of a possible step in the posttranscriptional control of gene expression?

A. the addition of methyl groups to cytosine bases of DNA
B. the binding of transcription factors to a promoter
C. the removal of introns and splicing together of exons
D. gene amplification during a stage in development
E. the folding of DNA to form heterochromatin

Transcription is the process of reading a DNA sequence and synthesizing an RNA transcript from it. Any form of post-transcriptional gene regulation would have to occur after that. This eliminates choice A. DNA methylation will not affect an RNA transcript. It has already been transcribed. B is also eliminated. Transcription factors only would affect DNA transcription. D and E also would only affect the process of transcription. They will not affect post-transcriptional gene expression. This brings us to the correct answer, choice C. Introns and exons are sequences coded in RNA transcripts. Any splicing or removing of these sequences are forms of post-transcriptional modifications.

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