In the lactose operon, the molecule that causes the repressor to fall off the promoter is which of the following?

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#Question id: 5755

#XL - S Microbiology

A researcher studying bacterial toxin predicts that a lysine within the toxin is important for binding it’s target cell.  She used site-directed mutagenesis to change a codon for lysine (AAA) to one for asparagine (AAU).  However, the mutant toxin still binds to its target cell just as well as the wild-type toxin bound and appears to have no other changes. This type of mutation is probably

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#Question id: 2166

#XL - S Microbiology

Typical ion/ligand concentrations are

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#Question id: 746

#XL - Q Biochemistry

Two separate chains of DNA are wound around each other, each following a helical (coiling) path, resulting in:

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#Question id: 17072

#XL - R Botany

Plastic Film, Teflon (fluoroethylenepropylene copolymer) is biologically inert and are extensively used for monolayer and suspension cultures as thry are

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#Question id: 516

#XL - S Microbiology

Which of the following elements is required for the enzymatic reaction that produces phosphoenolpyruvate?