Imagine that you have created a fusion between the Trp operon, which encodes the enzymes for tryptophan biosynthesis, and the Lac operon, which encodes the enzymes necessary for lactose utilization. Under which set of conditions (A–F below) will β-galactosidase be expressed in the strain that carries the fused operon?

A. Only when lactose and glucose are both absent.

B. Only when lactose and glucose are both present.

C. Only when lactose is absent and glucose is present.

D. Only when lactose is present and glucose is absent.

E. Only when tryptophan is absent.

F. Only when tryptophan is present.

TLS Online TPP Program

#Question id: 7543

#General Aptitude

Two train whose lengths 180m and 220m respectively are running in opposite direction with respective speeds of 40km/hr and 50km/hr. Time taken by them to cross one another will be (in seconds)

TLS Online TPP Program

#Question id: 7544

#General Aptitude

In what time (in second) will a train 140 meters long cross an electric pole, is its speed in 126km/hr?

TLS Online TPP Program

#Question id: 7545

#General Aptitude

How long a train 150 meters long running at the speed of 108km/hr take to cross a bridge 186 meters in length?

TLS Online TPP Program

#Question id: 7546

#General Aptitude

Two families travelling from Meerut to Nagpur (which is 390 km distance) in two cars, started at the same time travelling through the same road, without any traffic block or any abjections. The ratio of the speed of the car-1 and car-2 is 6:7. After how long travelling car-1 has to exchange the speed with car-2 so that they could each the destination at the same time?

TLS Online TPP Program

#Question id: 7547

#General Aptitude

In a toy, two men with red and blue caps are moving in two different circular paths of same radii. When the man with red cap moves 3 steps, the one with blue cap moves 5 steps in the same time, but the distance traversed by the man with red cap in 5 steps, is equal to the distance traversed by the man with blue cap in 4 steps. What is the number of rounds the man with red cap made the man with blue cap completed 100 rounds?

TLS Online TPP Program

#Question id: 7548

#General Aptitude

 It takes 10 s and 15 s respectively, foe two snakes travelling at different constant speeds to completely pass a small pebble. The length of the first snake is 120 cm and that of the second snake is 150 cm. the magnitude of the difference in the speeds of the two Snakes (in cm/s) is;