Homework Answers
Answer : The correct option is A ( Histones, Inhibited)
Explanation: Histones are the basic proteins that contain high amounts of basic amino acids such as arginine and lysine. They play a role in packaging eukaryotic DNA into structural units called nucleosomes. There are five types of histone proteins in eukaryotic chromosomes namely, H1, H2A, H2B, H3 and H4. H1 is called the linker histone and highly conserved and the last four histones in copies of two forms the histone octamer found at the centre of nucleosome.
When DNA is coiled/in a condensed state. the promoter sites are not accessable to the transcriptional machinery such as transcriprion factors as well as to RNA polymerase. This condensation of DNA is brought about by the packaging proteins called Histones. Apart from its involvement in DNA packaging, they also have a vital role in eukaryotic gene regulation which is brought about by acetylation and deacetylation of histone proteins. So condensed or coiled DNA is transcriptionally inactive.
Acetylation of Histones activates promotes, since acetylated histones releives DNA for transcription purpose, whereas deacetylated histones condenses DNA as their affinity for DNA increases, thus preventing transcription.
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need help uestion With respect to transcription of the lac operon, O it is activated when...
need help
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When and how does the RT-PCR test detect the presence of the virus? During PCR. by adding a fluorescent dye and a quencher dye which will be degraded if DNA polymerase finds the viral gene. The sample if positive fluoresces. After PCR, by adding a fluorescent dye which will be activated once the sample goes through a special laser. During PCR, by adding fluorescent primers that are detected through a special laser. After PCR, by adding a quencher dye which...
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D Question 3 2 pts When and how does the RT-PCR test detect the presence of the virus? After PCR, by adding a quencher dye which is activated when the viral DNA is available in high concentrations During PCR by adding fluorescent primers that are detected through a special laser After PCR, by adding a fluorescent dye which will be activated once the sample goes through a special laser. During PCR, by adding a fluorescent dye and a quencher dye...
The following sentences describe chromatin structure and how altering chromatin structure can affect gene expression. Complete each sentence using the words provided.In some cells, DNA combines with proteins to form a substance calledThe lowest level of chromatin structure consists of DNA wrapped twice around a group of histones to form a(n)The formation of nucleosomes may block the binding of transcription factors and RNA polymerase II to theThe structure of chromatin can be modified by altering either the DNA or the...
1. DNA is coiled around what type of proteins to form nucleosomes A. Polymerases DNA replication of the lagging strand is discontinuous B. Transcription factors DNA replication of the lagging strand is continuous C. Helicases D. Histones E. DICER 2. Which of the following statements is true? A. DNA replication of the leading strand is discontinuous B. DNA replication of the lagging strand is discontinuous C. DNA replication of the leading strand is dispersive D. DNA replication of the lagging...
The observation that in any DNA sample, A T and G C A. DNase sequencing An analytical method that determines which segments of DNA are bound by a particular B. Chargaff's rule protein factor, such as a transcription factor C. ChIP sequencing D. Euchromatin E. Histone acetylation F. major groove - # Areas associated with a eukaryotic gene that are where most DNA methylation occurs. # An analytical technique that involves a small slide or chip with many segments of...
need help
uestion With respect to transcription of the lac operon, O it is activated when the lac repressor releases the inducer molecule ® it is inactivated by CAP binding to the operator it is inactivated by cAMP's presence ( it requires RNA polymerase O all of the above are true LiC none of the above are truc
When and how does the RT-PCR test detect the presence of the virus? During PCR. by adding a fluorescent dye and a quencher dye which will be degraded if DNA polymerase finds the viral gene. The sample if positive fluoresces. After PCR, by adding a fluorescent dye which will be activated once the sample goes through a special laser. During PCR, by adding fluorescent primers that are detected through a special laser. After PCR, by adding a quencher dye which...
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