Tag: operon pyq

13. A merodiploid strain of E. coli with the genotype F+OCZ–Y+/ O+Z+Y+was constructed. The activity of β-galactosidase enzyme was measured in this strain upon following treatments. (A) no induction (B) […]

A bacterial stra•n can use carbohydrates and hydrocarbons as growth substrates. The strain uses glucose following a minimal lag period after inoculation, regardless of the other carbohydrates and hydrocarbons in […]

11. When budding yeast (a facultative anaerobe) is grown for a few days in medium containing high glucose it shows a growth pattern with two lag phases (see figure below). […]

10 Two E.coli Culture A and B are taken. Culture A was earlier grown in the presence of optimum concentration of gratuitous inducer IPTG. Both the cultures are now used […]

9. A culture medium contains two carbon sources, one is preferred carbon source (glucose) and the second is a non-preferred source (lactose). Which one below is correct regarding the nature […]

8. E. coli cells are growing in a medium containing lactose but no glucose. Indicate the expression status of the lac operon if glucose is added to the culture. (1) […]

7. E. coli is being grown in a medium containing both glucose and galactose. On depletion of glucose, expression of β-galactosidase will (1) remain unchanged (2) increase (3) decrease (4) […]

6. The lac operon in E. coli. is controlled by both the lac repressor and the catabolite activation protein CAP. In an in vivo experiment with lac operon, the following […]

In E. coli lac operon is positively as well as negatively regulated. This suggest that (1) E. coli rely only on glucose for energy (2) E. coli rely only on […]

Which one of the following conditions will switch on Lac operon in E. coli? (1) + Glucose, + Lactose (2) + Glucose, – Lactose (3) – Glucose, – Lactos (4) […]