Riobonucleoproteins named for their high concentrations of uracil (U1, U2, etc.) are commonly constituents of the

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Consider the biological context of uracil-rich ribonucleoproteins labeled U1, U2, etc. These small nuclear ribonucleoproteins (snRNPs) are components of a complex involved in RNA splicing, where pre-mRNA is processed to remove introns.

Option 1: spliceosome. This is the structure that houses snRNPs like U1 and U2 and catalyzes splicing; it is characteristically comprised of uracil-rich RNA components, making this choice consistent with the description.

Option 2: open promoter complex. This term refers to the assembly at a gene’s promoter during transcription initiation in bacteria and eukaryotes, not to uracil-rich snRNPs, so it does not match the description.

Option 3: 70S initiation complex. This is associated with the initiation stage of bacterial translation, involving ribosomal subunits and initiator tRNA, not snRNPs or uracil-rich RNAs, thus it is not correct here.

Option 4: 30S initiation complex. Similar to the previous, this relates to the ribosomal initiation in bacteria and lacks any association with uracil-rich splicing snRNPs, making it an unsuitable match.

In summary, the description points specifically to a splicing-related ribonucleoprotein complex rather than transcription or translation initiation complexes, which aligns with the spliceosome.

BIOL_2004_81774_202509 Genetics T3- Requires Respondus LockDown Browser

Riobonucleoproteins named for their high concentrations of uracil (U1, U2, etc.) are commonly constituents of the

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