The observation that in any DNA sample, A T and G C A. DNase sequencing An...
Identify the most accurate term related to chromatin remodeling. DNA is associated with proteins to form. A is compsed of DNA wrapped around an octamer of histone proteins. An activator can increase transcription by attracting a to the region. Addition of (-COCH_3) groups to histone amino terminal tails results in a/an in gene expression. Removal of acetyl groups from histones results in a/an in gene expression.
Part 1. Eukaryotes use at least two distinct mechanisms to control gene expression by altering the structure of chromatin around a particular gene. One of these mechanisms is the covalent modification of histones to switch DNA between an open and closed confirmation. A second mechanism is the covalent modification of DNA (typically on cytosines) by methylation. A. Describe a type of histone modification and explain what effect is has on chromatin, and how that effect is achieved. a. One type...
Which of the following is not true regarding regulation of gene expression in eukaryotes? In eukaryotic cells, transcriptional activators often work by recruiting the transcriptional macinery to gene promoters DNA methylation is an example of an epigenetic mark that can be inherited Acetylation of histones can result in a more open chromatin structure to allow transcription to occur Different genes can be turned off or on between different organs or stages of development Transcription factor DNA sequences are bound by...
3. Which of the following is not a good example of a housekeeping protein in eukaryotic cells? a)DNA polymerase b)histones c)RNA polymerase 4)hemoglobin Explanation: 4. Which of the following statements about histones is true? a. Histones activate transcription when bound to the promoter, b. Although RNA polymerase can access DNA packed around histones, the general transcription factors and transcriptional regulators cannot. c. Histone acetyltransferases affect transcription by adding acetyl groups to histones and altering chromatin structure to allow accessibility to...
If the two genes are unlinked, an organism with the genotype of AaBb can produce gametes containing either Aa or Bb. AB, Ab, aB, or ab. AaBb. AB or ab. none of the abov Which of the following is NOT correct about miRNA? It is involved with posttranscriptional regulation in eukaryotes. It leads to one type of RNA interference. Its name is derived from “mitochondrial RNA.” It binds to a complementary mRNA sequence. It is found in many different organisms,...
In eukaryotic genomes, regions of _____________________ are transcriptionally active while regions of ____________________ are transcriptionally silent. A) Heterochromatin; euchromatin B) Euchromatin; heterochromatin C) None of the above Which of the following proteins can regulate eukaryotic gene expression WITHOUT binding to the DNA in the regulatory region? A) repressors B) enhancers C) co-activators D) transcription factors In eukaryotes, transcriptional activity can be regulated by methylation of a dinucleotide sequence called "CpG." This modification occurs at a: A) Adenine B) Cytosine C)...
1. the genes that seem to be the most necessary to maintain, since they are present in the smallest cellular organisms are a. cytoskeletal protein genes b, translation protein genes c. replication protein genes d. transcription protein genes e. DNA repair protein genes 2. Why do cellular organisms generally look very similar when early embryos but different from each other when mature? a. their DNAs have different chemistry b. their RNAs are different lengths c. what genes get turned on...
A genetically engineered plasmid Ficarries all of the elements of the lac operon, but replaces the structural genes with the reporter gene green fluorescent protein (GFP). The repressor allele cannot bind lactose, and the OC allele cannot be bound by the repressor. Given the following genotypes and growth media that does not contain glucose, indicate in the table below whether you expect to see b-galactosidase activity and glowing green colonies of E. coli by selecting Yes or No. growth media...
onaformation from a ee is used in the synthesisof 17 functional gene product. A) Geno B) Gene regulation C) Epigenetics D) Imprinting E) Chromatin remodeling 18. A histone code is the: A) B) nucleotide sequence of an individual histone protein's gene. pattern of chemical modification of the DNA wrapped around an individual histone. C) D) E) pattern of chemical modification of the histone tails. number of amino acids in an individual histone that are methylated None of the other answer...
Yet, all the cells in your body contain the same genes (and same alleles). The difference across cell types is that genes get selectively expressed (turned on or off) based on the proteins needed for cellular function given their environment. Select which statement explains the reason why hair does not normally grow on your muscle cells. a. Muscle cells have the gene for keratin, but do not express it b. Muscle cells do not have the gene for keratin and...