Table of Contents
What is the most important point of control of gene expression?
In prokaryotes, transcription initiation is the main point of control of gene expression. It is chiefly controlled by 2 DNA sequence elements of size 35 bases and 10 bases, respectively. These elements are called promoter sequences as they help RNA polymerase recognize the start sites of transcription.
Why does gene expression need to be regulated quizlet?
Why do we regulate gene expression (two reasons)? We regulate gene expression because transcription and translation take lots of energy so we need it. And it would be a waste of energy to make all proteins in all cells.
What are the control mechanisms of genes?
Epigenome of germ cells and mechanisms of its regulation Gene regulation without sequence alterations is brought about by epigenetic mechanisms that involve three well-defined mechanisms such as (1) DNA methylation, (2) histone modifications and (3) RNA-associated pathways (Table 71.6).
How is gene expression regulated with transcription factors?
Transcription factors are proteins that help turn specific genes “on” or “off” by binding to nearby DNA. Transcription factors that are activators boost a gene’s transcription. Groups of transcription factor binding sites called enhancers and silencers can turn a gene on/off in specific parts of the body.
How is gene expression regulated or controlled quizlet?
Basically epigenetic modifications, or “tags,” such as DNA methylation and histone modification, alter DNA accessibility and chromatin structure, thereby regulating patterns of gene expression. …
What does regulation of gene expression mean quizlet?
Gene Regulation. Refers to the ability of cells to control the expression of their genes. Cell Differentation. The process by which cells become specialized into particular types.
How genes are controlled?
By gene expression we mean the transcription of a gene into mRNA and its subsequent translation into protein. Gene expression is primarily controlled at the level of transcription, largely as a result of binding of proteins to specific sites on DNA.
What does gene expression require?
Gene expression is the process the cell uses to produce the molecule it needs by reading the genetic code written in the DNA. To do this, the cell interprets the genetic code, and for each group of three letters it adds one of the 20 different amino acids that are the basic units needed to build proteins.