Wild type E. coli metabolizes the sugar lactose by expressing the enzyme ß-galactosidase. You have isolated a mutant that you call lac1–, which cannot synthesize ß-galactosidase and cannot grow on lactose (Lac–). During an condition Lac– strain, called lac3–, is linked to the Tn5 insertion. From a strain carrying the Tn5 insertion and lac3– mutation you isolate an F’ that caries a region of the chromosome that includes both Tn5 and the linked Lac region. Introduce this F’ into an F– strain carrying lac1– by selecting for Kanr. These merodiploids express ß-galactosidase normally. What does this result tell you about the relationship between the lac3– and lac1- mutations?  

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#Question id: 7529

#General Aptitude

A jogger Running at 10 km/h allong side aur railway track in 150 m i head of the engine of a 300 M long train running at 64 km/hr in the same direction in how much time will the train pass the Jogger?

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#Question id: 7530

#General Aptitude

Two trains are moving in opposite directions at 72 km per hour and 90 km per hour . Their lengths are 500 m and 400 m respectively. the time taken by the Slower train to cross the faster train is

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#Question id: 7531

#General Aptitude

Two runners A and B start running from diametrically opposite points on a circular track in the same direction. If A runs at a constant speed of 8 km/h and B at a constant speed of 6 km/h and A catches up with B in 30 minutes , what is the length of the track?

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#Question id: 7532

#General Aptitude

A train running at 36 kmph crosses a mark on the platform in 8 seconds and takes 20 seconds to cross the platform. What is the length of the platform ?

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#Question id: 7533

#General Aptitude

A 3 m long car goes past a 4 m long truck at rest on the road .The speed of the car is 7 m/s . The time taken to go past is

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#Question id: 7534

#General Aptitude

A person wanted to travel from charabag to Alambag with an average speed of kmph by car. The distance between Charbag and Alambag is 2 km . Due to heavy traffic, he could travel at 30 kmph for the first kilometer of his journey . What should his speed his speed be for the remaining journey to achieve his average speed target of 60 kmph ?