274 cards
The ____ is a negative control, repressible system.
____ systems allow constant production of a protein product.
In repressible system, the repressor made by the regulator gene is inactive until it binds to a ____.
In ____ system, the repressor made by the regulator gene is inactive until it binds to a corepressor.
Transcription factors are transcription-activating proteins that search the DNA looking for specific ____.
____ are transcription-activating proteins that search the DNA looking for specific DNA-binding motifs.
Transcription factors tend to have two recognizable domains: ____ domain.
The DNA-binding domain binds to ____ .
A DNA ____ is a sequence of DNA that binds only to specific transcription factors.
A DNA response element is a sequence of DNA that binds only to ____.
The ____ domain of transcription factors allows for the binding of several transcription factors and other important regulatory proteins.
Once the transcription complex is formed, ____ transcription can begin.
The DNA regulatory base sequences are known as ____ regulators.
Transcription factors are known as ____ regulators.
Several response elements may be grouped together to form ____.
Upstream promoter elements must be within ____ bases of start gene.
Enhancer regions in DNA must be within ____ bases of the start gene.
Eukaryotic cells accomplish expression increase through ____.
In eukaryotic cells, DNA is packaged in the nucleus as ____.
In order to get access to DNA, we need to do ____.
Heterochromatin is ____ under the microscope.
Euchromatin is ____ under the microscope.
Remodeling of the chromatin structures regulates ____ levels in the cell.
Histone acetylases acetylate ____ proteins.
____ acetylate lysine residues found in the amino terminal tail regions of histone proteins.
Acetylation of histone proteins decreases the ____ the interaction of the histone with DNA.
____ of histone proteins decreases the positive charge on lysine residues and weakens the interaction of the histone with DNA.
____ are proteins that function to remove acetyl groups from histones.
DNA methylation of genes is often linked with ____.
DNA ____ of genes is often linked with the silencing of gene expression.
DNA methylases add methyl groups to ____ nucleotides.
____ regions of the DNA are much more heavily methylated.
____ will both downregulate the transcription of a gene.
Histone deacetylation and DNA methylation will both ____ the transcription of a gene.