Answer:
1. Histone methylation occurs at different amino acids: c. Activates and inactivates
2. A transcriptional binds an enhancer sequence: d. No effect
3. Histone acetyltransferase attach acetyl groups to the N-terminus of histones: a. Activates
4. Histone deacetylases remove acetyl groups from the N-terminus of histones: b. Inactivates
Explanation:
Epigenetics refers to the mechanisms associated with changes in gene expression which do no involve alteration in DNA sequence. Epigenetic marks include DNA methylation and histone modifications (acetylation, methylation, phosphorylation, etc). These mechanisms act together in order to regulate gene expression at specific genomic sites (<em>loci</em>). Histone methylation is an epigenetic mark involved both in transcriptional repression and transcriptional activation. For example, trimethylation of the histone H3 at lysine 4 (H3K4me3) has been associated with transcriptional activation, while dimethylation of histone H3 at lysine 9 (H3K9me2) is often involved in transcriptional repression. Moreover, histone acetylation by histone acetyltransferases (HATs) is an epigenetic mark that is involved in transcriptional activation and chromatin decondensation, while histone deacetylation by deacetylases (HDACs ) is generally associated with gene repression. However, it is important to highlight that there are exceptions to this rule (for example, acetylation of the histone H4 lysine 20 is associated with gene repression). Finally, transcriptional activators are proteins that bind to enhancers in order to recruit coactivator proteins/complexes and thus activate transcription.
Answer:
The nucleus.
Explanation:
The nucleus is basically "the boss" of DNA along with housing it. Hope this helps!
Answer:
The mandibular canal, also referred to as the Inferior Alveolar Canal (IAC), sits within the mandible. It serves the purpose of housing the <em>inferior alveolar nerve</em> which is responsible for supplying sensation to the lower teeth.
This canal also houses the <em>inferior alveolar vein</em> - a dental vein whose function is to (with the assistance of the posterior alveolar artery) drain blood from the lower teeth and jaw.
A picture of the mandibular canal is attached.
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It allows plants to lose water and heat more quickly as temperature increases, prevents the plant from wasting energy by growing leaves when the temperatures are too cold, prevents the plant from getting too hot during the summer months of the year and it allows plants to perform photosynthesis as soon as temperatures are warm enough. Hope this helps :)
The answer is C. not pluripotent
Hope it helps!!
