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- The diagram below shows the structure of DNA from the level of a gene to a condensed mitotic chromosome. At each of the four locations marked, indicate how a gene may be regulated by selecting from the choices given. Some answer choices may fit into more than one position; however, you should use each answer choice only once. Choices given: Alternative splicing within the gene sequence can lead to different forms of mRNA. A promoter region can be blocked by another protein. Histone deacetylation can prevent DNA from unwinding. A regulatory region can be bound and increase transcription rates.In eukaryotic chromatin, tightly coiled scaffolding proteins would indicate a region where genes are currently expressed at high levels. True or FalseDNA methylation is considered an epigenetic phenomenon because the pattern of methylation can be inherited. Briefly discuss the question of whether histone modifications in chromatin represent an epigenetic phenomenon.
- The following image shows the 'beads-on-a-string' model of DNA and the effects of histone modification on chromatin structure. What effect does histone acetylation have on Gene 1? Gene 1 De-acetylation Acetylation Ac Ac Gene 1 Ac Ac Ac O Acetylation increases expression of Gene 1 O Acetylation decreases expression of Gene 1 O Acetylation causes a mutation in Gene 1 O There is no way to tell from this figureIn eukaryotes which of the following combination of chromatin conditions would be most likely to result in the highest levels of expression of gene?Which of the following statements correctly describes the structure of chromatin around the promoter of an active eukaryotic gene? O A. It is in the form of heterochromatin and the nucleosomes are tightly wrapped. O B. It is in the form of euchromatin and the nucleosomes are cleared from the region allowing for an open and accessible configuration OC.A repressor protein is bound to the chromatin blocking RNA polymerase. O D.Both B and C.
- Changes in chromatin packing correlate with changes in gene expression in most cells. Why do you think this is the case?Describe the major steps involved in gene transcription. This answer must not exceed 1200 words. This answer can include hand drawn diagrams if you wish.This is a list of molecular changes that could happen during DNA replication, transcription, mRNA processing, or translation. For each, determine whether or not the change will be passed down through generations of cells after it occurs. Explain your answer. C->G point mutation in the DNA of a coding region of a gene A->T point mutation in the noncoding region of a gene An error in transcription changes the mRNA sequence such that what was an amino acid-coding codon in the DNA sequence is now a stop codon in the mRNA sequence. An error in translation causes the amino acid alanine (nonpolar) to be replaced by the amino acid glutamic acid (polar and negatively charged).
- (b) (c) Point mutations in multiple tumor suppressor proteins have been linked to cancer. For example changes in the gene for adenomatous-polyposis-coli protein (APC gene) may result in colorectal cancer. Consider the following DNA sense strand. 3-TAC CGG TTG TGA AGC TGA ATC-5' Derive the mRNA molecule from the given DNA strand sequence above, paying attention to the polarity of the molecule. (i) (ii) (iii) (iv) Write down the polypeptide chain sequence arising from the mRNA molecule of the question above, using the table of the genetic code (Table Q1 overleaf) and indicate the C- and the N-terminus of the peptide chain. Point mutations of a cytosine (C) often lead to the dysfunction of the APC protein. Write down all possible polypeptide chains that can result from all possible DNA mutations of cytosines, disregarding a mutation in the MET/START and STOP codons. Specify which of the point mutations identified in (d) are redundant? For the given tRNA for Thrombin (Thr) write down all…Using the figure below identify: What is the role of histones and nucleosomes? How the process of chromatin condensation is performed? What is a function of introns and exons? What is a role of mobile DNA elements? What is a meaning of simple-sequence DNA?Possible genetic modifications that can cause epigenetic changes in gene expression include: A- all answers are correct B- histone acetylation C- chromatin remodeling D- histone variant localization  e- DNA methylation
