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21 Cards in this Set
- Front
- Back
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The DNA sequence encoding rRNA are called _______, and is typically clustered in the genome.
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rDNA
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In nondividing cells, rDNA are clustered in the _______, where ribosomes are produced.
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nucleoli (nucleolus singular)
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In the nucleolus, the _______ contains DNA that codes for the rRNA.
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Fibrillar Center (fc)
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In the nucleolus, the _______ contains the nascent pre-rRNA transcripts.
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Dense Fibrillar Component (dfc)
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In the nucleolus, the _______ is thought to contain ribosomes at various levels of assembly.
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Granular Component (gc)
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What are the three main components of the nucleolus?
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-fibrillar component (fc)
-dense fibrillar component (dfc) -granular component (gc) |
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How are rRNA genes arranged?
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In tandem (one after another, facing the same direction).
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What kind of "pattern" does rRNA transcription have?
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Christmas Tree
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The _______ separates transcription units in a ribosomal gene cluster.
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Non-transcribed spacer
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Pre-rRNA contains large numbers of _______ nucleotides and _______ residues.
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-methylated
-pseudouridine |
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The 5S rRNA genes are located where?
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Outside of the nuceleolus.
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What transcribes 5S rRNAs?
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RNA polymerase III
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Processing of pre-rRNA is helped by _______.
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Small, nucleolar RNAs (snoRNAs)
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snoRNAs are packaged with proteins into _______.
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Small, nucleolar ribonucleoproteins (snoRNPs)
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_______ modify bases in pre-RNAs.
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snoRNAs
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How many residues are in:
methylation pseudouridine |
meth: 100 residues
pesu: 95 residues |
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How many tRNAs are there in plants and animals?
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Around 50
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Where are tRNA genes located?
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In small clusters scattered around the genome.
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Where is the promoter sequences of tRNAs located?
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Within the coding region of the gene.
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What is tRNA transcribed by?
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RNA polymerase III
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During processing, the tRNA _______ is trimmed and numerous _______ must be modified.
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-precursor
-bases |
