aqa a level biology help

If cDNA binds to mRNA, preventing a gene from being made into a protein, does that prevent transcription? because technically the mRNA has been made already but it's just being suppressed. so shouldn't you say that the cDNA has prevented translation, not transcription?

This is the exam question i'm looking at. https://prnt.sc/cga4PKNcziFA
The MS says that when the cDNA binds to mRNA, it prevents transcription. but i'm questioning whether transcription has already happened. (so would the MS be slightly wrong then?)

Reply 1

Biolover2020

11

Original post by GhostHawk

If cDNA binds to mRNA, preventing a gene from being made into a protein, does that prevent transcription? because technically the mRNA has been made already but it's just being suppressed. so shouldn't you say that the cDNA has prevented translation, not transcription?

This is the exam question i'm looking at. https://prnt.sc/cga4PKNcziFA
The MS says that when the cDNA binds to mRNA, it prevents transcription. but i'm questioning whether transcription has already happened. (so would the MS be slightly wrong then?)

Hi, yeah i agree with you, I think that the binding of cDNA to the complementary mRNA would prevent translation of the mRNA, not transcription of it as the mRNA has already been produced. I'm not sure why the MS says that transcription would be inhibited?