alleryStart learning →Where do the promoters of genes transcribed by RNA polymerase III lie?
AAlways about 30 bases upstream of the gene
BAlways inside the coding part of the gene
CUpstream of the gene or within the gene
DAlways downstream of the last base of a gene
Answer & Solution
Correct answer: C. Upstream of the gene or within the gene
1. Conserved promoter elements differ for the genes read by each of the three polymerases.
2. Genes transcribed by RNA polymerase III have upstream promoters or promoters that occur within the genes themselves.
3. Both arrangements are therefore possible, so any option saying always is too strong.
4. A fixed position about 30 bases upstream describes the TATA box of a polymerase II promoter instead.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 15 "Genes and Proteins", section 15.3 Eukaryotic Transcription_
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