Choose the incorrect statement 

A. Lariat formation is characterized by 2’-5’ phosphodiester bond

B. Lariat formation is characterized by 3’-5’ phosphodiester bond

C. Group II mitochondrial introns are excised by the same mechanism as nuclear pre-mRNAs via a lariat that is held together by a 2’–5’ bond.

D. Group II mitochondrial introns are excised by the different  mechanism as nuclear pre-mRNAs via a lariat that is held together by a 2’–5’ bond.

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#Question id: 15621

#Unit 13. Methods in Biology

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. If the merodiploid were Lac–, 

a) the two mutations lie in the different gene.

b) Both mutation are complement each other

c) the two mutations lie in the same gene.

d) Both of the mutations is dominant to wild type.

what could you conclude about the relationship between the lac3– and lac1– mutations from  these statements?

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#Question id: 15683

#Unit 2. Cellular Organization

A common application of dry heat in the microbiology laboratory is to

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#Question id: 8707

#Unit 9. Diversity of Life Forms

Use the figure to answer the following question

The phylogenetic tree shown ________.

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#Question id: 5606

#Unit 5. Developmental Biology

During which one of the following stages of A. thaliana embryogenesis, cell elongation throughout the embryonic axis and further development of the cotyledons occur?

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#Question id: 23119

#Unit 2. Cellular Organization

Disparity in genome content vs evolutionary status is called as