What would likely result from a mutation in the promoter for lac operon structural genes that increased the number of RNA polymerase molecules that bind to the DNA?
_____ Polycistronic mRNA production would increase.
_____ LacI protein production would increase.
_____ Lactose would be metabolized much faster.
_____ Lactose would be metabolized much slower.
_____ Repression at the lacO site would not be reduced but expression would increase regardless.
__X__ Polycistronic mRNA production would increase.
_____ LacI protein production would increase.
__X__ Lactose would be metabolized much faster.
_____ Lactose would be metabolized much slower.
__X__ Repression at the lacO site would not be reduced but expression would increase regardless.
You might also like to view...
You are studying a type of cell that you don't know much about. You want to determine what organism the cell comes from. You decide to watch cell division in this plant using the appropriate cell biology tools
After some experimentation, you determine that cytokinesis in this cell is sensitive to myosin inhibitors. You are likely studying A. a plant cell. B. an animal cell. C. a bacterial cell. D. a cell type that has not been previously studied.
Two types of cholesterol are found in human blood, HDL and LDL. Clinical studies have shown that
the risk of coronary heart disease is greatest for a person with a ____ level of HDL in their blood and a ____ level of LDL in their blood.
a. high; low b. low; low c. low; high d. low; moderate e. moderate; moderate
The constant region of a light chain is indicated by number
a. 1. b. 2. c. 3. d. 4. e. 5.
Which of the following best explains why anabolic steroid abuse by male athletes can lead to a decrease in testes size?
A) High levels of anabolic steroids cause the adrenal glands to release more estrogen. B) Circulating anabolic steroids increase the release of FSH and LH, which slow down growth and function of the testes. C) High levels of anabolic steroids increase the production of testosterone through positive feedback, which decreases the size of the testes. D) High levels of anabolic steroids decrease the production of testosterone through negative feedback, which decreases the size of the testes. E) Circulating anabolic steroids decrease the release of FSH and LH, which slow down growth and function of the testes.