Lac Operon – RNA Basics
Über den Vortrag
Der Vortrag „Lac Operon – RNA Basics“ von Kevin Ahern, PhD ist Bestandteil des Kurses „RNA and the Genetic Code“.
Quiz zum Vortrag
Which of the following occurs in the lac operon?
- The CAP protein binds to DNA when it binds to cAMP.
- The lac repressor binds DNA once it binds to allolactose.
- The RNA polymerase binds to the promoter when it is bound to lactose.
- It is turned off when the cell has low energy and lactose is present.
- There is high gene expression when glucose levels are high and lactose is present.
What will happen to the lac operon in the presence of high levels of glucose and lactose?
- Very low basal levels of lac operon gene expressions will be observed in the cell.
- Very high levels of lac operon gene expressions will be observed in the cell.
- The β-galactosidase enzyme will be expressed in the cell, while the other two genes will not be transcribed.
- The β-galactoside permease enzyme will be expressed in the cell, while the other two genes will not be transcribed.
- The β-galactoside permease and β-galactoside transacetylase enzymes will be produced, while β-galactosidase enzyme will not be transcribed.
What will happen to the lac operon if there is no cellular glucose or lactose?
- The binding of the lac repressor protein to O-site will oppose the action of CAP protein present on CAP site, and hence the lac operon will not be expressed.
- The lac operon will be expressed as CAP protein will be present at the CAP site.
- The high levels of cAMP will facilitate the lac gene expressions by facilitating the RNA polymerase binding to the promoter site.
- The high levels of CAP protein on the promoter site will cause the overexpression of lactose metabolism-related genes.
- The repressor protein binding to the O-site will not occur, and hence the lac operon will be expressed at its fullest.
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Dozent des Vortrages Lac Operon – RNA Basics
Kevin Ahern, PhD
Dr. Kevin Ahern is a Professor in the Department of Biochemistry and Biophysics at Oregon State University (OSU), USA.
He obtained his PhD in Biochemistry from Oregon State University. Currently, he teaches courses for health sciences students at OSU.
He is co-author of three Open Educational electronic textbooks on Biochemistry and a Guide to Getting Into Medical School.
Due to his achievements, he earned OSU’s highest teaching recognition, the Elizabeth P. Ritchie Distinguished Professor Award in 2017.
Within Lecturio, Dr. Ahern teaches courses on Biochemistry and on "How to Get into Medical School”.
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