explain the heirarchy of DNA packaging: Nucleousomes, chromatin fibers, etc. differences between stages in the heirarchy
4) Eukaryotic genes require the compact chromatin fibers to uncoil for DNA to be accessed by RNA polymerase. This chromatin remodeling is mediated by cis-acting elements and trans-acting factors. Describe the difference and name the two key players (one cis and one trans) that help to form the pre-initiation complex.
Briefly describe three differences between transcriptionally active chromatin regions when compared with other regions of chromatin that are transcriptionally silent.
describe how chromatin can be used to limit the transcription of genes. include the differences between euchromatin, and heterochromatin, and how the two types of chromatin can be interchanged.
The amount of DNA in cells of a particular species is measured at various stages of meiosis; the following amounts are found: 3pg, 6pg, 12pg: Match the amounts of DNA found to the stages of the cell cycle (you may use each amount more than once, all amounts may not be needed etc). Explain your choice.
QUESTION 18 Histone modifying enzymes (HATS, HDACs, etc) and chromatin remodeling complexes (SWI/SNF, etc) actively control gene expression. Their actions, in turn, are controlled by o Transcription Factors O DNA Polymerase o Histone H1 Mitochondria
Which statements about the modification of chromatin structure in eukaryotes are true? 1.DNA is not transcribed when chromatin is packaged tightly in a condensed form 2.Some forms of chromatin modification can be passed on to future generations of cells 3.Acetylation of histone tails in chromatin allows access to DNA for transcription 4.Acetylation of histone tails is a reversible process. 5. Methylation of histone tails in chromatin can promote condensation of the chromatin 6. Deacetylation of histone tails in chromatin loosens...
1. briefly describe the structure of chromatin. 2.Explain how DNA gyrase works 3. sketch a typical Cloverleaf structure for transfer RNA. Point out any similarities between the cloverleaf pattern and the proposed structures of ribosomal RNA. 4. which type of RNA has the least amount of secondary structure?
1. Identify four differences between: a. heart contractile cells and skeletal muscle fibers b. heart contractile cells and smooth muscle fibers 2. What are four similarities between: a. heart contractile cells and skeletal muscle fibers b. heart contractile cells and smooth muscle fibers
Please try to explain some of the main differences between Western (US, Canada, Europe...etc) and Eastern (Middle East, Asia...etc) cultural ethics in general (ex: family relationship, impact of religion/belief, values and traditions, business behavior/etiquette, bribery, gender differences, sexual orientations....etc) . Please Try to use some related personal examples and thoughts, and use online sources for help; site all references at the end of your paper (3-4 pages double spaced).
QUESTION 28 A cell with defective chromatin remodeling complexes (SWI/SNF, ISWI, etc.) would be expected to experience... O abnormal patterns of gene expression O increased transcription an increased mutation rate O errors in DNA replication