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TLS Online TPP Program

#Question id: 15618

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  isolate  a second Lac– mutation, which you designate lac2-. Using P1 phage on this strain and use the resulting phage lysate to infect the lac2- strain, selecting for   Kanr   transductants. In this case, all 100   Kanr   transductants that are examined are Lac–. What does this result tell you about the relationship between the lac1- and lac2- mutations?

#Unit 13. Methods in Biology
  1. lac1- and lac2- mutations are very far from each other, they are linked, and are mutations in two different genes.
  2.  lac1- and lac2- mutations are very far from each other, they are unlinked, and are mutations in same genes.
  3. lac1- and lac2- mutations are linked, and are mutations in same genes.
  4.  lac1- and lac2- mutations are very far from each other, they are unlinked, and are mutations in two different genes.
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TLS Online TPP Program

#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
TLS Online TPP Program

#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 ?
TLS Online TPP Program

#Question id: 7535

#General Aptitude

Ratio between speed of boat in still water to speed of stream is 5 : 2. If 224 km is travelled by downstream in 4 hours then find the difference between speed of boat in still water and speed of stream?
TLS Online TPP Program

#Question id: 7536

#General Aptitude

Two stations A and B are 220km apart on a straight line. One train starts from A at 7 am and travels towards B at 20km/hr speed. Another train starts from B at 10 am and travels toward A at a speed of 20 km/hr. At what time they will meet?
TLS Online TPP Program

#Question id: 7537

#General Aptitude

A train 220m long passed a pole in 20 seconds. How long it will take to pass a platform 550m long?
TLS Online TPP Program

#Question id: 7538

#General Aptitude

Two trains of equal length are running on parallel lines in the same direction at 57km/hr and 39km/hr. The faster train passes the slower train in 20sec. The length of each train is?