6.3 Transcription and RNA Processing - AP Biology

[@aubs1120]

These videos make way more sense than the ones posted on AP Classroom!

[@siri4119]

You’ve helped me understand a week’s worth of my lectures in a 14 minute video better than my teacher could ever have done. You’re seriously the only way I’ll ever pass this class so I just want to say thank you so much for your videos, they help me understand everything so much better

[@poseknowsbio]

I'm just so glad I've been able to help! It's a really tough class but I have a feeling you'll do just fine :)

[@youssefsamehmohamedshakera7665]

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[@creflookekemgbajiaka9990]

really appreciate the videos. Has really helped me pass my class👍🏽

[@harshac6245]

as a freshman this will help me with my 150 question exam about just dna

[@lucianafajardo4072]

Hello I have a question. Does Transcription have the other enzymes (helicase, topoisomerase and single-strand binding proteins)? And when transcription occurs does the dna go into a replication fork (like in dna replication)? Thank you!

[@poseknowsbio]

Hi Luciana - these are good questions! To my knowledge, yes: those enzymes are still necessary when transcribing because the two DNA strands must still be separated in order to make the mRNA transcript. And also, yes. RNA polymerase works in a similar way to DNA polymerase in that it creates a new polynucleotide strand in the 5'-3' direction.

[@lucianafajardo4072]

Hello again hahah! Whn you say that RNA polymerase binds to the template strand of DNA, aren;t both the strands of DNA templates? because they are complementary to each other, what amkes one the template strand for transcription to happen?

[@poseknowsbio]

RNA polymerase only binds to the strand where the target gene is located, therefore making that strand the template strand. Transcription factors and things like gene switches (Topic 6.5) determine what gene is going to be expressed. The two strands are complementary, however you won't get the same RNA transcript from one side as you would the other because RNA polymerase creates a transcript in only the 5'-3' direction.

[@josephnee7046]

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[@poseknowsbio]

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