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:
Fish in a small pond will most likely depend on which of the following biotic factors to meet their needs? Plants that exchange gasses with the pond water. Insects that feed on other insects in the pond. Water birds that prey on amphibians and small fish.
Explanation:
Answer:
D
Explanation:
the most common thing insects do with their antenna is smell
1.well mutations can cause cancers and alot of diseases however in some cases mutations can be good. for example people in Africa are not affected by malaria
2. the deletion or addition basically change of order in the genetic code. for example A goes with T. DNA can be damaged if A is paired with C
Measurements would be everything that is not an instruction. To sum that up, everything in the left should be circled EXCEPT makes 3 loaves
A.) Liquid is measured in mL so everything with mL is a liquid 826mL+80mL+158mL= 1,064 mL
B.) Dry items are measured in g so everything ending with g is dry item 14g+7g+120g+1,135g= 1,276g
