It is possible to calculate the number of clones that must be present in a gene library to give a probability of obtaining a particular DNA sequence. This formula is:

 

where N is the number of recombinants, P is the probability and f is the fraction of the genome in one insert. Thus for the E. coli DNA chromosome of 5 × 10 ⁶ bp andan insert size of 20 kb ( f = 0.004), the number of clones needed ( N ) would be 1 × 10 ³ ,with a probability of P will be

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#Question id: 7554

#General Aptitude

A jogger inside a railway tunnel at a constant speed hears a train approaching the tunnel from behind at a speed of 30 km/hr, when he is one third of the away inside the tunnel. Whether he keeps running forward or turns back, he will reach the end of the tunnel at the same time the train reaches that end. The speed of the running man is

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#Question id: 7555

#General Aptitude

A man can row at 8 km per hour in still water. If it takes him thrice as long to row upstream, as to row downstream, then find the stream velocity?

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#Question id: 7556

#General Aptitude

By travelling at 40 kmph, a person reaches his destination on time. He covered two-third the total distance in one-third of the total time. What speed should he maintain for the remaining distance to reach his destination on time?

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#Question id: 7557

#General Aptitude

Walking with 4/5 of my usual speed, I miss the bus by 5 minutes. What is my usual time?

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#Question id: 7558

#General Aptitude

A man walks 6 km at a speed of 3/2 kmph, runs 8 km at a speed of 2 kmph and goes by bus another 32 km. Speed of the bus is 8 kmph. Find the average speed of the man.

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#Question id: 7559

#General Aptitude

A car starts from A for B travelling 20 km an hour. 3/2 hours later another car starts from A and travelling at the rate of 30 km an hour reaches B 5/2 hours before the first car. Find the distance from A to B.