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#Question id: 4129
#SCPH28 | Zoology
Which of the following statements about the tRNA that normally accepts phenylalanine is false? (mRNA codons for phenylalanine are UUU and UUC.)
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#Question id: 15620
#SCPH01 Biochemistry
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: 466
#SCPH05 I Biotechnology
When a reduction half-reaction is ________ (negative, positive), electrons flow to the more readily reduced substance which is ________ (negative, positive) in value.
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#Question id: 16072
#SCPH05 I Biotechnology
Which of the following is not a benefit of FASTA over BLAST?
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#Question id: 6949
#SCPH06 I Botany
During gastrulation in Xenopus, the future mesoderm and endoderm move inside the embryo through the "blastopore"; in contrast, in chickens, gastrulation involves cells moving inward through the: