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 third mutant, MelC–, which gives constitutive melibiase expression. The MelC– mutation is closely linked to Mel1 and MelB–. Genetic tests of the MelC– mutation yield the following:

 

As above, classify the MelC– mutation in terms of its basic genetic properties and explain how you arrived at your conclusions.

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#Question id: 1547

#SCPH06 I Botany

follicular dendritic cells (FDCs) secrete CXCL13 and its receptor, CXCR5, which is expressed on B cells, function of this interaction ?

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#Question id: 20998

#SCPH06 I Botany

C-phenol present in Activated sludge are usually biodegraded by which microorganism?

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#Question id: 673

#SCPH06 I Botany

How many complete turns are there in an ideal α-helix that contains 15 amino acids and has a pitch of 0.54 nm and a rise of 0.15 nm?

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#Question id: 3438

#SCPH28 | Zoology

The type of learning that causes specially trained dogs to salivate when they hear bells is called

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#Question id: 18373

#I Life Science/ Life Sciences Group – I-V

Scientists engineered a bacterial strain of P. fluorescens which is able to degrade 2,4-dinitrotoluene. This bacteria also helps in