Course Guide Chapter 17: Regulation of Gene Expression

Question 1

What are inducible operons?

Answer 1

mostly turned off, and they are turned on only when necessary

Question 2

What are repressible operons?

Answer 2

mostly turned on, and they are turned off when not needed

Question 3

What are the four levels of gene regulation in eukaryotes?

Answer 3

1. long-term transcriptional control and short-term transcriptional control
2. post-transcriptional regulation
3. translational regulation
4. post-translational modification

Question 4

What are transposable elements?

Answer 4

provide the opportunity for various genes to be moved from one place to another

Question 5

What is tissue-specific gene expression?

Answer 5

During and after development, genes are expressed in a tissue-specific manner to facilitate the function of different cell or tissue types

Question 6

What is coordinated gene expression?

Answer 6

Multiple genes in a biochemical pathway may be located in different loci of a same chromosomes or sometimes in different chromosomes. All of them need to be expressed in a coordinated manner by having a similar regulatory sequences recognized by a common transcription factor

Question 7

What is the role of the trans-acting factors?

Answer 7

recognize specific cis-acting elements on the DNA by binding to a specific DNA base sequence and inducing or inhibiting transcription