You are studying a new strain of E. coli that can utilize the disaccharide melibiose very efficiently. You find that utilization depends on the enzyme melibiase, which is encoded by the gene Mel1. Mel1 is not expressed unless melibiose is present in the growth medium. Next you isolate a mutation, designated MelB–, which gives uninducible melibiase activity. Mapping experiments show that MelB– is linked to Mel1. Using an F' factor that carries the chromosomal region surrounding Mel1, you perform the following genetic tests:

 

Describe the proposal for the type of regulatory functions affected by the MelB– mutation.

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#Question id: 12899

#General Aptitude

Two solid right cones of equal height and of radii r1 and r2 are melted and made to form a solid sphere of radius R. Then the height of the cone is 

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#Question id: 12900

#General Aptitude

The perimeter of the base of a right circular cylinder is 'a' unit. If the volume of the cylinder is V cubic unit, then the height of the cylinder is 

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#Question id: 12901

#General Aptitude

The difference of perimeter and diameter of a circle is X unit. The diameter of the circle is 

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#Question id: 13153

#General Aptitude

The in-radius of an equilateral triangle is of length 3 cm. Then the length of each of its medians is

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#Question id: 14089

#General Aptitude

 If the orthocentre and the centroid of a triangle are the same, then the triangle is :

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#Question id: 5969

#General Aptitude

The calendar of the year 1897 can be used again in the year?