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If gene expression control occurs after transcription when did it occur after RNA was synthesized while RNA was synthesized while proteins are synthesized after proteins are synthesized?
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How do our genes control our proteins?
Genes contain our DNA. Proteins are synthesized according to data on DNA
Can eukaryotic Cells control gene expression by using transcription factors?
yes
How prokaryotes control gene expression?
The operon often controls the transcription of prokaryote genes.
What controls inherited characteristics?
The characteristics of an individual are controlled by genes through specificity in the synthesis of proteins. In another words, gene expression depends on the type of protein synthesized by that gene.
Regulation of gene expression in eukaryotes?
First A. = 'usually involves operons'. 2nd A. = 'No ... that is done by prokaryotes and is a much simpler way of organizing genetic switches and regulating expression. Eukaryotes use a much more complex network involving the likes of enhancers, silencers, insulators, trans and cis acting sequences. Trans acting sequences are sequences which code for particular proteins (like repressor proteins) which bind to operator regions etc. Cis acting are sequences such as operator and promoter regions (usually bound by particular proteins such as repressors or RNAP/DNAP, transcription factors...) and control gene expression within a close proximity and usually found downstream from the operator/promoter. Enhancers are sequences found way upstream from the promoter sequences. These are bound by activator proteins (rather than transcription factors like promoter sequences) and once bound form a loop like structure bringing the bound activator protein to transcription factors and polymerases bound at the promoter region up-regulating gene expression. Silencers work in a similar fashion but bind proteins down-regulating gene expression. Methylation and acetylation of histone tails can bring about the regulation of gene expression. For example acetylation of the lysine residues in histone proteins will nullify the positive charges causing them to have a lower affinity for the negatively charged DNA molecules allowing RNAP and DNAP to associate easier causing up-regulation of gene expression. Methylation leads to hetero-chromatination (facultative hetero-chromatin - also formed through gene silencing from RNAi through siRNA molecules) leading to down regulation of gene expression. Again gene expression can be controlled through the length of the pol-A tail added post-transcriptionally. The length usually determines the half life of the molecule (with a shorter tail causing the destruction of the mRNA a lot more quickly). Also within the 3'untranslated region (between stop codon and 3' end) targets the localization of an mRNA strand within the cytoplasm playing a small role in gene regulation.'
How do our genes control our proteins?
Genes contain our DNA. Proteins are synthesized according to data on DNA
Can eukaryotic Cells control gene expression by using transcription factors?
yes
How prokaryotes control gene expression?
The operon often controls the transcription of prokaryote genes.
How do cells control gene expression?
The promoter allows the gene to be transcribed. It helps RNA polymerase find where a gene starts. An operator is a DNA segment that turns the gene "on" or "off." It interacts with proteins that increase the rate of transcription or block transcription from occurring.
How does your DNA control what you become?
DNA codes for proteins, which make up nearly every part of the body. Through transcription and translation, DNA can be expressed in proteins.
Which is true about eukaryotic gene regulation?
Most eukaryotic genes are controlled individually and have regulatory sequences that are much more complex than those of the lac operon. (this answer above was found in my Biology text book too so it is correct) :)
Does DNA control the production of enzymes?
Yes DNA contains the "blueprints" of the cell, everything the cell makes it does with directions from DNA thank you so much!
What controls inherited characteristics?
The characteristics of an individual are controlled by genes through specificity in the synthesis of proteins. In another words, gene expression depends on the type of protein synthesized by that gene.
Regulation of gene expression in eukaryotes?
First A. = 'usually involves operons'. 2nd A. = 'No ... that is done by prokaryotes and is a much simpler way of organizing genetic switches and regulating expression. Eukaryotes use a much more complex network involving the likes of enhancers, silencers, insulators, trans and cis acting sequences. Trans acting sequences are sequences which code for particular proteins (like repressor proteins) which bind to operator regions etc. Cis acting are sequences such as operator and promoter regions (usually bound by particular proteins such as repressors or RNAP/DNAP, transcription factors...) and control gene expression within a close proximity and usually found downstream from the operator/promoter. Enhancers are sequences found way upstream from the promoter sequences. These are bound by activator proteins (rather than transcription factors like promoter sequences) and once bound form a loop like structure bringing the bound activator protein to transcription factors and polymerases bound at the promoter region up-regulating gene expression. Silencers work in a similar fashion but bind proteins down-regulating gene expression. Methylation and acetylation of histone tails can bring about the regulation of gene expression. For example acetylation of the lysine residues in histone proteins will nullify the positive charges causing them to have a lower affinity for the negatively charged DNA molecules allowing RNAP and DNAP to associate easier causing up-regulation of gene expression. Methylation leads to hetero-chromatination (facultative hetero-chromatin - also formed through gene silencing from RNAi through siRNA molecules) leading to down regulation of gene expression. Again gene expression can be controlled through the length of the pol-A tail added post-transcriptionally. The length usually determines the half life of the molecule (with a shorter tail causing the destruction of the mRNA a lot more quickly). Also within the 3'untranslated region (between stop codon and 3' end) targets the localization of an mRNA strand within the cytoplasm playing a small role in gene regulation.'
Which is true of transcription factors?
They control which genes are expressed.
An enhancer affects what level of genetic control?
transcription
How does a gene control a cell?
A gene is a segment of DNA which codes for a specific protein. Through transcription and translation, a protein is produced and then is used for cell processes.genes control the cell by controling what proteins are expressed. these proteins could be enzymes, controling what chemical reactions the cell can carry out, structural proteins, controling the physical properties of the cell (shape etc.) or a number of other protein types that can control passage into and out of the cell, storage of molecules and how often the cell devides, to name but a few.
