A key precursor in the synthesis of aromatic amino acids (tryptophan, tyrosine and phenylalanine) is ________.

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#Question id: 1764

#Unit 4. Cell Communication and Cell Signaling

Which of the following is NOT a feature of germinal center B-cells?

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#Question id: 3752

#Unit 3. Fundamental Processes

Which of the following investigators was (were) responsible for the discovery that in DNA from any species, the amount of adenine equals the amount of thymine, and the amount of guanine equals the amount of cytosine?

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#Question id: 15726

#Unit 12. Applied Biology

Tissues and cells cultured in a liquid medium produce culture of single cells and cells clumps of few to many cells

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#Question id: 32249

#Unit 2. Cellular Organization

Soluble ER-resident proteins contain which sorting signal that allows them to be retrieved?

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#Question id: 31228

#Unit 2. Cellular Organization

Which of the following protein is involved to inhibit Cdc25 phosphatase and hold it into inactive condition?