- 1 What reduces gene expression?
- 2 How is gene expression altered?
- 3 What are the two stages of gene expression?
- 4 What factors increase gene expression?
- 5 What are two ways in which eukaryotic cells regulate gene expression?
- 6 Why is control of gene expression important?
- 7 Is gene expression inherited?
- 8 What is gene expression in simple terms?
- 9 What are the 3 parts of a gene?
- 10 What are the 4 steps of translation?
- 11 What does gene expression depend on?
- 12 How do hormones affect gene expression?
- 13 Where Does gene expression occur?
What reduces gene expression?
By binding to specific sites within the 3′-UTR, miRNAs can decrease gene expression of various mRNAs by either inhibiting translation or directly causing degradation of the transcript. The 3′-UTR also may have silencer regions that bind repressor proteins that inhibit the expression of a mRNA.
How is gene expression altered?
Several genetic or epigenetic events can alter gene expression and we assess their importance in multistage carcinogenesis. Mutation and chromosome rearrangement can produce changes in DNA sequence which have been identified in some cancer cells.
What are the two stages of gene expression?
Transcription: the production of messenger RNA (mRNA) by the enzyme RNA polymerase, and the processing of the resulting mRNA molecule. Translation: the use of mRNA to direct protein synthesis, and the subsequent post-translational processing of the protein molecule.
What factors increase gene expression?
The expression of genes in an organism can be influenced by the environment, including the external world in which the organism is located or develops, as well as the organism’s internal world, which includes such factors as its hormones and metabolism.
What are two ways in which eukaryotic cells regulate gene expression?
Eukaryotic gene expression is regulated during transcription and RNA processing, which take place in the nucleus, and during protein translation, which takes place in the cytoplasm. Further regulation may occur through post-translational modifications of proteins.
Why is control of gene expression important?
Controlling gene expression is critical to a cell because it allows it to avoid wasting energy and raw materials in the synthesis of proteins it does not need. Thus, it allows a cell to be a more streamlined and versatile entity that can respond to changing conditions by adjusting its physiology.
Is gene expression inherited?
Now researchers show robust evidence that not only the inherited DNA itself but also the inherited epigenetic instructions contribute in regulating gene expression in the offspring. We are more than the sum of our genes.
What is gene expression in simple terms?
Gene expression is the process by which the information encoded in a gene is used to direct the assembly of a protein molecule. The cell reads the sequence of the gene in groups of three bases.
What are the 3 parts of a gene?
Genes have three regions, the promoter, coding region, and termination sequence. The promoter turns the gene on. The coding region has the protein building information, and the termination sequence indicates the end of a gene. The promoter and the coding region are the gene regions that are normally modified.
What are the 4 steps of translation?
Translation happens in four stages: activation (make ready), initiation (start), elongation (make longer) and termination (stop). These terms describe the growth of the amino acid chain (polypeptide). Amino acids are brought to ribosomes and assembled into proteins.
What does gene expression depend on?
Broadly speaking, we can say that a cell’s gene expression pattern is determined by information from both inside and outside the cell. Examples of information from inside the cell: the proteins it inherited from its mother cell, whether its DNA is damaged, and how much ATP it has.
How do hormones affect gene expression?
Hormonal Control of Gene Expression
The protein hormones do not enter the cell, but bind to receptors in the cell membrane and mediate gene expression through intermediate molecules. Steroids, though actually enter the cell and interact with steroid receptor proteins to control gene expression.
Where Does gene expression occur?
Prokaryotic gene expression (both transcription and translation) occurs within the cytoplasm of a cell due to the lack of a defined nucleus; thus, the DNA is freely located within the cytoplasm. Eukaryotic gene expression occurs in both the nucleus (transcription) and cytoplasm (translation).