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: 12725

#SCPH28 | Zoology

Match the following

DNA form	Helix Direction	Number of bases per helix turn
1. B	a. Left Handed	i. 10
2.  A	b. Right Handed	ii. 12
3.  C	c. Left Handed	iii. 14
4. Z	d. Right Handed	iv. 9

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#Question id: 14500

#SCPH01 Biochemistry

A fair die is tossed 180 times. The expected number of sixes is

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#Question id: 754

#SCPH28 | Zoology

If the twisting of the DNA is in the same direction as that of the double helix, that is the helix is twisted up before closure, this form of super coiling is known as;

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#Question id: 22942

#SCPH01 Biochemistry

In the floral meristem, the FT protein forms a complex with

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#Question id: 11592

#SCPH06 I Botany

Gibberellin biosynthesis precursor is____