Each DnaB–DnaC complex consists of six DnaC monomers bound to a hexamer of DnaB.

Note that the DnaB helicase cannot open double-stranded DNA; it can only unwind DNA that has already been opened, in this case by DnaA.

DnaB binding to single-stranded DNA is the signal to hydrolyze ATP and for release of DnaC.

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#Unit 3. Fundamental Processes

Unlike the other elements within the promoter, the UP-element is not recognized by s but is recognized by a carboxy-terminal domain of the subunit, called the aCTD .

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#Unit 2. Cellular Organization

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#Unit 5. Developmental Biology

The limb bud is regionalized into 3 functional domains

1. Progress zone

2. Zone of polarizing activity

3. Apical ectodermal ridge

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#Unit 5. Developmental Biology

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#Unit 4. Cell Communication and Cell Signaling

There are 18 different antigenic subtypes for HA and 11 for NA.