E. coli cells grown on 15N medium are transferred to 14N medium and allowed to grow for two more generations (two rounds of DNA replication). DNA extracted from these cells is centrifuged. What density distribution of DNA would you expect in this experiment?

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#Question id: 15617

#Unit 13. Methods in Biology

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: 784

#Unit 1. Molecules and their Interaction Relevant to Biology

Which is not a difference between B-DNA and A-DNA?

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#Question id: 28996

#Unit 7. System Physiology – Animal

Fat and muscle cells contains insulin-responsive glucose transporter localized to small vesicles in the cytosol, fusion of vesicles with the plasma membrane in presence of glucose, these glucose transporters are____

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#Question id: 14881

#Unit 4. Cell Communication and Cell Signaling

The paradigmatic adult stem cell niche, contains several cell types that coordinate HSC development, including in column I and column II

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#Question id: 28966

#Unit 7. System Physiology – Animal

During Hyperthyroidism leads to following condition, except?