What are the principles of regulation of gene expression in prokaryotes? use examples.
Principles of Gene regulation in Prokaryotes
In prokaryotes the regulation of transcription takes place with helps of operon which consists of regulatory DNA sequence that acts as binding site for regulatory proteins. This either inhibits or promotes transcription. There are some operons that are inducible and can be turned on by presence of a particular small molecule. There are operons that are repressible and can be turned off by a small molecule.
The operons contains number of genes and regulatory DNA sequences which control transcription of the operon. The sequences binds to the regulatory proteins that control the operon. The promoter or site where RNA polymerase binds is an example of the regulatory DNA sequence.
The operons might be inducible or repressible:-
Some operons are off but can be turned on by a small molecule. This molecule is known as inducer and the operon is called as inducible. Example – The lac operon is an inducible operon which encodes enzymes for the process of metabolism of lactose. When there is lactose sugar present, it turns on the operon. The other type of operon is the repressible operon like the trp operon which encodes enzymes for synthesis of the amino acid tryptophan. The operon is expressed by default, but can be repressed due to high levels of amino acid tryptophan.
What are the principles of regulation of gene expression in prokaryotes? use examples.
How are the activators and repressors different in eukaryotes vs prokaryotes for regulation of gene expression?
QUESTION 9 Regulation of gene expression by eukaryotes is more complicated that in prokaryotes. The promoter region contains proximal regulatory sequences that are called _regulatory elements. These proximal regulatory elements bind trans-acting proteins that are called __factors.
QUESTION 9 Regulation of gene expression by eukaryotes is more complicated that in prokaryotes. The promoter region contains proximal regulatory sequences that are called _regulatory elements. These proximal regulatory elements bind trans-acting proteins that are called __factors.
What gene regulation mechanism do eukaryotes share with prokaryotes? OA) Varying the promoter sequence to vary the binding affinity of general transcription factors. OB) Regulating the expression from a single gene with several specific transcription factors. C) Controlling gene expression by restricting access to the promoter. D) Driving the expression of several genes with one promoter. OE) Controlling the expression from a single gene with several general transcription factors.
Detailed explanation plz. 4. In class, we discussed that regulation of gene expression in eukaryotes and prokaryotes have some similarities and some differences. I want you to focus on what's different between these two type of cells: name TWO mechanisms of control of gene expression that are only used by eukaryotes and discuss why each of those mechanisms wouldn't be possible in prokaryotes. [4 pts]
Both prokaryotes and eukaryotes regulate gene expression, turning genes on and off in response to various cues. Which of the following mechanisms is common to both types of cells? Choose all that apply. alternative splicing of mRNA opening or condensing chromatin transcriptional regulation post-translational regulation
2. Give 2-3 examples of gene regulation in eukaryotes. Define what they are and how they specifically regulate gene expression 3. What is histone acetyltransferase enzyme? How does it regulate gene expression? Explain your reasons 4. What is chromatin remodeling in general? 5. What is DNA methylation? What does methylation mean in this case? How does it intervene gene expression? Explain your reason
Transcriptional control of gene regulation is common in both prokaryotes and eukaryotes. Which of the following is not true? Both prokaryotes and eukaryotes: A. exhibit both positive and negative control. B. have repressors that impact expression. C. often requires interactions with DNA that is not proximal to structural genes. D. have genes that are closely related in function located proximally on a chromosome
Regulation of Gene Expression in Eukaryotes In all organisms, certain genes are expressed at any given time while other genes are not. Both prokaryotes and eukaryotes regulate gene expression at the transcription stage. However the greater complexity of eukaryotic cells makes it possible for gene expression to be regulated at many other stages as well. The diagram below shows different stages at which gene expression may be regulated in eukaryotes. nucleus chro modifica anscription RNA processing cytoplasm degradation protein processing...
Give two examples about inducible/repressible gene expression. Explain the function of the genes, the mechanism of the regulation, and why it is important to have a way to control the level of gene expression.