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#Question id: 15620
#SCPH28 | Zoology
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: 1666
#I Life Science/ Life Sciences Group – I-V
What is the first immunoglobulin heavy chain class to be expressed on the surface of a newly produced B-cell?
TLS Online TPP Program
#Question id: 4815
#SCPH28 | Zoology
The cross over percentage between linked genes J and M is 20%, J and L is 35%, J and N is 70%, L and K is 15%, M and N 50%. The sequence of genes on the chromosome is
TLS Online TPP Program
#Question id: 3650
#SCPH01 Biochemistry
Which of the following is true for the most important form of DNA damage which produces pyrimidine dimers from adjacent pyrimidine bases?
TLS Online TPP Program
#Question id: 15209
#SCPH06 I Botany
Agarose gels are formed by suspending dry agarose in aqueous buffer, in which usually Agarose concentration between