A researcher would like to map the location of galE and trpA genes in a new species of bacterium that appears to be closely related to E. coli. He decides to use cotransduction, and generatesnappropriate donor and recipient strains. He is disappointed when cotransduction is not seen in his experiement. What is the most reasonable explanation for this situation?

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#Question id: 15849

#Unit 4. Cell Communication and Cell Signaling

Host-pathogen interactions are an ongoing arms race; pathogens evolve to express unique structures that avoid host detection, and the host germline-encoded recognition system co-evolves to match these new challenges. However, because pathogens generally have much shorter life cycles than their vertebrate hosts, and some utilize error-prone DNA polymerases to replicate their genomes, pathogens can evolve rapidly to evade host encoded recognition systems. Which error prone DNA polymerase is used  by human?

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#Question id: 15850

#Unit 4. Cell Communication and Cell Signaling

For innate and adaptive immunity to work together, these two systems must be able to communicate with one another. This communication is achieved by both cell-cell contact and by soluble messengers. Most of these soluble proteins are growth factor–like molecules known by the general name cytokines. Which of these molecule can work as communicator between innate and adaptive immunity?

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#Question id: 15851

#Unit 5. Developmental Biology

In Drosophila, the X chromosome appears to encode four protein factors that activate the early promoter of Sxl. Which of the following factor activate JAK-STAT pathway?

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#Question id: 15852

#Unit 5. Developmental Biology

Which of the following protein  process doublesex pre-mRNA in a female-specific manner?

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#Question id: 15853

#Unit 5. Developmental Biology

In XY cells, the early promoter is not active and there is no early Sxl protein because-

TLS Online TPP Program

#Question id: 15854

#Unit 5. Developmental Biology

In which drosophila developmental stage late promoter becomes active?