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Transcription

Transcription is the first step of gene expression, in which a particular segment of DNA is copied into RNA by the enzyme RNA polymerase. Both RNA and DNA are nucleic acids, which use base pairs of nucleotides as a complementary language that can be converted back and forth from DNA to RNA by the action of the correct enzymes. During transcription, a DNA sequence is read by an RNA polymerase, which produces a complementary, antiparallel RNA strand called a primary transcript. As opposed to DNA replication, transcription results in an RNA complement that includes the nucleotide uracil (U) in all instances where thymine (T) would have occurred in a DNA complement. Also unlike DNA replication where DNA is synthesized, transcription does not involve an RNA primer to initiate RNA synthesis.Although Transcription is nice.


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What makes dominant allele dominant?

1) each gene can have from one to many alleles 2) it's not only about expression. The difference can be anywhere from transcription to protein post-translational modifications. There can be mutation in the promotor changing significantly expression. If the binding of ribosome will ...

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by JackBean
Thu Feb 27, 2014 5:20 pm
 
Forum: Genetics
Topic: What makes dominant allele dominant?
Replies: 5
Views: 1176

Sigma Factor Functions in Bacterial vs. Eukaryotes

PLEASE HELP! BIOCHEMISTRY HOMEWORK Sigma factor performs four important functions, each required before transcription can begin at a core promoter in bacteria. A) List the four functions. B) Name the transcription factors found in eukaryotes that provide these same four functions. ...

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by sabrina9
Sat Nov 02, 2013 9:49 pm
 
Forum: Molecular Biology
Topic: Sigma Factor Functions in Bacterial vs. Eukaryotes
Replies: 0
Views: 611

Protein synthesis during S phase

... is no protein synthesis during S phase? If it is so, I'd say it's because the DNA is busy with all the replication and thus cannot lose time with transcription.

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by JackBean
Wed Sep 25, 2013 11:10 am
 
Forum: Cell Biology
Topic: Protein synthesis during S phase
Replies: 3
Views: 1245

Protein synthesis during S phase

Hi, Why does protein synthesis no occur during the S phase? i.e., why is there no transcription during replication (I'm assuming transcription, not translation, is stopped). i've been looking everywhere for this answer, and I'm starting to think it's something ridiculously ...

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by yuriw
Wed Sep 25, 2013 3:03 am
 
Forum: Cell Biology
Topic: Protein synthesis during S phase
Replies: 3
Views: 1245

Nucleotide metabolism

they are important mainly for DNA replication and of course for transcription

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by JackBean
Mon Aug 19, 2013 1:19 pm
 
Forum: Cell Biology
Topic: Nucleotide metabolism
Replies: 2
Views: 576
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