Wild type E. coli metabolizes the sugar lactose by expressing the enzyme ß-galactosidase. You have isolated a mutant that you call lac1–, which cannot synthesize ß-galactosidase and cannot grow on lactose (Lac–). During an condition you have a wild type (Lac+) strain carrying a Tn5 insertion known to be near several Lac genes on the E. coli chromosome. You grow P1 phage on this strain and use the resulting phage lysate to infect the lac1– strain, selecting for kanamycin resistance (Kanr). Among 100 Kanr transductants, you find that 82 are Lac– and 18 are Lac+. Express the distance between Tn5 and the lac1– mutation as a cotransduction frequency;

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#Question id: 1192

#Unit 4. Cell Communication and Cell Signaling

In the NF- κB signaling pathway, which of the following molecules is downstream of I- κB kinase?

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#Question id: 12368

#Unit 1. Molecules and their Interaction Relevant to Biology

In Thymine base structure methyl group is present at position

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#Question id: 10567

#Unit 6. System Physiology – Plant

Cell A is having solute potential of -14 and Pressure potential of 3. Cell B is having Solute potential of -16 and Pressure potential of 4. The water will travel from

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#Question id: 28291

#Unit 5. Developmental Biology

cortical granules form an osmotic gradient which causing water to enter and swell the space between the vitelline envelope and the cell membrane. these cortical granules is released by____

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#Question id: 698

#Unit 1. Molecules and their Interaction Relevant to Biology

Amino acid residues commonly found in the middle of B turn are: