Enzyme X exhibits maximum activity at pH = 6.9.  X shows a fairly sharp decrease in its activity when the pH goes much lower than 6.4.  One likely interpretation of this pH activity is that:

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#Question id: 13069

#SCPH01 Biochemistry

A negative agglutination test may NOT indicate the

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#Question id: 18641

#SCPH05 I Biotechnology

Which one of the following is NOT an algorithm for building phylogenetic trees? 

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#Question id: 15620

#SCPH06 I Botany

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 Lac– strain, called lac3–, is linked to the Tn5 insertion. From a strain carrying the Tn5 insertion and lac3– mutation you isolate an F’ that caries a region of the chromosome that includes both Tn5 and the linked Lac region. Introduce this F’ into an F– strain carrying lac1– by selecting for Kanr. These merodiploids express ß-galactosidase normally. What does this result tell you about the relationship between the lac3– and lac1- mutations?  

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#Question id: 20844

#SCPH28 | Zoology

Nitrate is energetically the best electron acceptor under which type of conditions

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#Question id: 17078

#SCPH01 Biochemistry

In HGPRT negative cells which pathway is blocked of nucleotide synthesis