HSCs begin their life in close contact with osteoblasts located close to the lining of the endosteal cavity. Once differentiated to the pre-pro-B-cell stage, the developing B cells require Which type of signals from the chemokine, which is secreted by a specialized set of stromal cells?

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#Question id: 367

#XL - Q Biochemistry

1.0 × 10^−4 mole of H+ (as HCl) is added to 1.0 liter of pure water. Determine the final pH of the solution.

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#Question id: 8691

#XL - S Microbiology

Use the following information to answer the question.

Applying the principle of parsimony to the trait "ability to fly," which of the two phylogenetic trees is better?

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#Question id: 4630

#XL - S Microbiology

Which pair would have been likely to agree that strata such as those depicted here were deposited gradually over long periods of time by subtle mechanisms that are still at work?

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#Question id: 3936

#XL - Q Biochemistry

The large RNA-protein complex that processes introns and exons is called __.

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#Question id: 3460

#XL - T Zoology

The many eyes hypothesis suggests prey flock because: