Term
| transcription initiation complex |
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Definition
| transcription factors & RNA polymerase II bound to a promoter (in eukaryotes) |
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Term
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Definition
crucial in forming the initiation complex in eucaryotes
a key component of many promoters used by RNA polymerase II |
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Definition
TATA binding protein
[image] |
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Term
| What are the two processing steps that occur only on transcripts destined to become mRNA molecules? |
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Definition
| capping and polyadenylation |
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Term
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Definition
| involved modification of the 5' end. The 5' end is the end that is synthesized first during transcription. The RNA is capped with a guanine (G) nucleotide with a methyl group attached. Occurs after about 25 nucleotides have been transcribed |
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Term
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Definition
| provides newly transcribed RNA with a special structure on their 3' ends. In eukaryotes the 3' end is trimmed, then a second enzyme adds repeated adenine nucleotides (poly-A tail) |
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Term
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Definition
Broad term for the modifications that an RNA undergoes as it reaches its mature form. For a eucaryotic mRNA, processing typically includes capping, splicing, and polyadenylation.
both ends of the primary transcript are altered
some interior parts of the molecule and other parts are spliced together |
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Term
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Definition
5' end receives a modified nucleotide cap
3' end gets a poly-A tail
- facilitate export of mRNA from nucleus (through pores)
- protect mRNA from hydrolytic enzymes
- help ribosomes attach to the 5' end
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Term
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Definition
| most eukaryotic genes and their RNA transcripts have long noncoding stretches of nucleotides between coding regions called introns |
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Definition
| the parts that aren't introns, they will be expressed or translated into amino acid sequences |
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Definition
| removes introns and joins exons, creating an mRNA molecule with a continuous coding sequence |
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Definition
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Term
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Definition
| polypeptide encoded depends on which segments are treated as exons during RNA splicing.... greater number of proteins and organism can produce |
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