Repressible Operons
About the Lecture
The lecture Repressible Operons by Georgina Cornwall, PhD is from the course Gene Regulation.
Included Quiz Questions
Which of the following statements is NOT true regarding repressible operons?
- The trp operon found in E. coli is a group of genes that encode biosynthetic enzymes for the amino acid alanine.
- RNA polymerase keeps on transcribing the repressible operon in the normal state.
- The presence of tryptophan shuts down the activity of the trp operon by binding to and activating the repressor protein.
- The trp operon is an excellent example of a repressible operon in bacterial cells.
- The activated repressor protein binds to the operator site of the trp operon and halts the movement of RNA pol to transcribe trp genes.
What is the difference between a gene that is repressed and one that is induced?
- A repressible gene is turned on in its native state until a repressor molecule binds the operator. On the other hand, an inducible gene is turned off in its native state until an inducer molecule is activated to turn it on.
- Repressible genes are turned on in the presence of an inducer molecule. On the other hand, a gene that is induced is turned on because a repressor molecule is absent.
- A repressible gene is turned off and an induced gene is activated to be expressed.
- There is no functional difference between a gene that is repressed and one that is induced.
- A repressible gene is turned off in its native state until a repressor molecule binds the operator and turns it on. On the other hand, an inducible gene is turned on in its native state until an inducer molecule is activated to turn it off.
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Author of lecture Repressible Operons
Georgina Cornwall, PhD
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Despite the mishaps, I thought the information was understandable. Especially the ending when she connected Trp and Lac operons with repressible and inducible.
The lecturer tripping up make it a little difficult to follow but it is made clear in the end.
This is incredibly difficult to follow with the lecturer mis-speaking constantly
