In the urea cycle the nitrogen atoms originate from ________.

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#Question id: 15700

#SCPH05 I Biotechnology

In a sequence database of a given size, which of the following expressions is likely to retrieve more matches (X means any amino acid; any of the residues in square brackets can occupy that position)?

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#Question id: 7026

#SCPH01 Biochemistry

humans with homozygous mutant alleles of HOXA13  have:

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#Question id: 4597

#SCPH06 I Botany

Cotton-topped tamarins are small primates with tufts of long white hair on their heads. While studying these creatures, you notice that males with longer hair get more opportunities to mate and father more offspring. To test the hypothesis that having longer hair is adaptive in these males, you should ________.

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#Question id: 1091

#SCPH01 Biochemistry

Why does testosterone, a lipid-soluble signaling molecule that crosses the membranes of all cells, affect only target cells?

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#Question id: 15603

#SCPH06 I Botany

Novel antibiotic can be made by