Describe how most eukaryotic genes are controlled Why is methionine formylation in prokaryotes? How is DNA packaged in the nucleus of somatic cells? How does a RNA virus reproduce its genome? How does the nucleus control which proteins are made by the ribosomes?
Why do reticulocytes have ribosomal RNA? Which of the following enclose their DNA in a nucleus? a. prokaryotes b. bacteria c. eukaryotes d. viruses What are operons in eukaryotes? In a eukaryotic cell, RNA polymerase enzymes are synthesized in the a) mitochondria, by mitochondrial ribosomes....
Eukaryoticvs.Prokaryoticgenes Likeinprokaryotes,Eukaryoticgenesareregionsof DNAthatactastemplatesfortheproductionofRNA byRNApolymerases RecallProkaryotictranscription: –TranscriptionfactorsbindtospecificDNAsequencesupstream ofthestartofoperons,orsetsofrelatedgenes. ...
223 bp containing 506 protein-coding genes. Quality assessment of the draft showed a high degree of completeness. Comparative analysis with other phytoplasmas revealed the absence of potential mobile units and a reduced amount of putative phage-derived segments, suggesting a low genome plasticity. ...
Eukaryotic transcriptional regulation (1) No operon structure. Some of the general methods used to control expression in prokaryotes are used in eukaryotes, but nothing resembling operons is known. (2) No (or few) instances of multigenic mRNA. Coordinately regulated genes usually are dispersed. ...
Why do eukaryotic cells need to be able to turn genes on and off as necessary? Why does primase make RNA and not DNA? Why is DNA acidic? Why don't all cells make all proteins coded for their DNA? Why is DNA polymerase used in PCR?
Why do humans have introns? Why are introns only in eukaryotic DNA? Do bacteria have double-stranded RNA? Do archaea have single-stranded DNA? Does a retrovirus have a genome made of RNA? Do viruses have ribosomal RNA? What are operons in eukaryotes? Do helminths have DNA? Does eukaryotic...
promoters of the phage genes. 200 nt/s at 37 ºC. 2. Regulation of gene transcription • Promoter (Sigma factor/the s polypeptide): most of house-keeping genes • Operon (操纵子): gene cluster which are controlled coordinately
1.3.1Threefactorsregulatingtranscriptioninitiation byRNApolymerase: 1.3.1.1specificityfactors(特异性因子)alterthe specificityofRNApolymeraseforagiven promoterorsetofpromoters,e.g.σ 70 σsubunit(usuallyσ 70 )oftheE.coliRNA polymerase.σ 32 foritsheatshockgenes; Ineukaryoticcells,someofthegeneral ...
, althoughitisquitefeasiblethatthe DKPsdonotfunctionasbacteria- to-bacteriasignallingmolecules perse,theymighthavearolein modulatingprokaryotic–eukaryotic interactions.Inthisrespect,itis worthnotingthatcertainAHLs possesspotentimmunomodula- tory 10 andcardiovascularactivity 11 . Inbacteria,theproductionof DKPsis...