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Why does chromatin remodeling have to be the first step in gene activation?
Wiki User
∙ 12y ago
Eukaryotic DNA can be highly packaged in condensed chromatin and inaccessible to transcription factors and RNA polymerase.
Wiki User
∙ 12y ago
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Which method is utilized by eukaryotes to control their gene expression that is not used in bacteria?
control of both RNA splicing and chromatin remodeling
Are changes in chromatin structure and histone DNA binding associated with gene activity?
yes
What hormones work by direct gene activation?
The steroid hormones.
Protein phosphorylating enzymes help regulated gene expression by?
protein activation
Does direct gene activation involve a second-messenger system?
No, it diffused throught the membrane.
What amino acid-based hormone uses the direct gene activation method?
Thyroxine
Through gene expression the messages encoded in the DNA contained in a cell direct the cells activity Which of the following sentences best defines gene expression?
Gene expression is the activation of a gene that results in the formation of a protein.
True or false Changes in chromatin structure and histone-DNA binding are associated with changes in gene activity?
there is research this is true
How do DNA methylation and histone acetylation affect chromatin structure and the regulation of transcription?
When chromatin is tightly compacted and dense, it's called Heterochromatin. When chromatin is loosely packed, its called Euchromatin. Euchromatin is easily accessible to transcription enzymes, while herterochromatin makes transcription impossible because the enzymes cannot access the DNA. Therefore, a gene within heterochromatin cannot be expressed. Also, look up how histone modifications such as histone acetylation affect gene expression.
What is the purpose of chromatin?
"The primary functions of chromatin are to package DNA into a smaller volume to fit in the cell, to strengthen the DNA to allow mitosis and meiosis and prevent DNA damage, and to control gene expression and DNA replication." I would just go with the first one, to package the DNA into a smaller volume.
When cell signaling causes a response in the nucleus what happens?
There is an activation of a specific gene by a growth factor.
What are the processes involve in proteinsynthesis?
the processes involved are gene activation,transcription(initiation,elongation,termination,editing),amino acid activation and translation(initation,elongation,termination) and protein folding.
