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. You have isolated a mutation that causes constitutive melibiase activity, which you designate MelA–. P1 phage mapping experiments using a Tn5 insertion linked to Mel1 show that MelA– is not linked to Mel1. Moreover you find that when an amber suppressor is introduced into a MelA– mutant, normal melibiase regulation is restored. Classify the MelA– mutation on the basis of genetic properties,  make a proposal for the type of regulatory functions affected by the MelA– mutation?

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#Question id: 14217

#SCPH05 I Biotechnology

In a microbial system how true yields are related to apparent growth yield? 

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#Question id: 14129

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

Global alignment is based on ________

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#Question id: 8912

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

Both animals and fungi are heterotrophic. What distinguishes animal heterotrophy from fungal heterotrophy is that only animals derive their nutrition

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#Question id: 2626

#SCPH28 | Zoology

lac operator is made up of

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#Question id: 6961

#SCPH28 | Zoology

Do HOX genes play a role in the development of C. elegans?