HELP ASAP!! please type question an answer typed for Genitics

1. What are microRNAs? lncRNAs? What are some different ways that gene
expression can be regulated at the level of translation?
3.. Define positive and negative gene regulation; combinatorial control? How can one
transcription factor function as both an activator and a repressor?

4. How does the regulation of histones and chromatin control gene expression?
What is the function of HATs, HDACs and methyltransferases?
5. How is it possible for epigenetic âmarksâ to be inherited that are not part of the
DNA sequence?

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Beverley SmithLv2

20 Dec 2018

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Related questions

â¢ Identify the mechanisms for gene expression control in the lac and trp operons

â¢ Explain what transcription factors and regulatory proteins are and how they regulated gene expression in eukaryotes.

â¢ Describe how chromatin structure (DNA methylation and histone modification) can affect gene expression

â¢ Explain the process of protein degradation and its purpose

â¢ Contrast the mechanisms regulating gene expression depending on when they act on: 1) regulating transcription, 2) posttranscriptionally (regulating the mRNA and protein synthesis) and posttranslationally (regulation of protein degradation)

silveralpaca631

1.) What type of control best describes the lac operon when it is regulated by allolactose? Explain the features of this type of regulation using the lac operon as an example.

2.) What is positive gene regulation?

a) when an activator protein binds to the operator of a gene to turn expression off

b) when a repressor protein binds to the operator of a gene to turn expression off

c) when an activator protein binds to the operator of a gene to turn expression on

d) when a repressor protein binds to the operator of a gene to turn expression on

e) when a protein binds to DNA to change gene expression

3.) In the lactose operon of E. coli, what is the function of each of the following genes or sites: a) regulator, b) operator, c) promoter, d) structural gene Z and e) structural gene Y?

a) regulator gene

b) operator

c) promoter

d) structural gene Z

e) structural gene Y

4.) In a negative, repressible regulatory mechanism, transcription of the structural gene(s) occurs in

a) the presence of the co-repressor, but not in its absence.

b) the absence of the co-repressor, but not in its presence.

c) the presence of the inducer, but not in its absence.

d) the absence of the inducer but not in its presence.

e) the absence or presence of the co-repressor.

What are answers and can you explain them to me?

How do the proteins of the transcription machinery access DNA that is tightly associated in chromatin?

Name the three yeast proteins required for the control of gene expression by galactose. What is the function of each of these proteins?

List four examples (there are at least six) of transcriptional regulation mechanisms or elements (types of signals, proteins and/or DNA sequence elements) unique to eukaryotes (compared to bacteria).