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: 19739

#Unit 3. Fundamental Processes

Telomeric RNA component in yeast and human are encoded by

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#Question id: 7038

#Unit 5. Developmental Biology

During sea urchin development, micromeres retain their specification is to secrete an autocrine factor:

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#Question id: 11802

#Unit 6. System Physiology – Plant

Damaged sieve elements are sealed off, but because of the processs that plug sieve plates pores, excuded phloem sap from wounds that sever sieve elements. Exudation of sap enhanced by the inclusion of;

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#Question id: 33410

#Unit 1. Molecules and their Interaction Relevant to Biology

In general, proteins whose folding is chaperone-dependent pass down a pathway in which of the following acts first

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#Question id: 28714

#Unit 2. Cellular Organization

COPI Vesicle transport from cis Golgi network to ER, these COPI vesicle coated with proteins_____?_____