The staggering of the collagen trimmers gives the fibrils a striated appearance in the electron microscope.
a. true
b. false
Ans: a. true
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How is initiation at oriC regulated in bacteria?
A. SeqA binds to hemimethylated DNA and sequesters the newly replicated origin. B. DnaA-ADP, formed when DnaA hydrolyzes its ATP, cannot maintain the destabilization of the origin so the closed complex reforms. C. The Hda protein binds the ? clamp causing DnaA to hydrolyze its ATP. D. RNA polymerase activity produces superhelical twisting that promotes melting of the origin by DnaA. E. All of these choices are correct.
Nutrients clearly limit the growth of plants. Explain four ways that plants have adapted to increase access to nutrients and what limits the association from becoming more common.
What will be an ideal response?
Biogeography is the study of the ____
a. distribution of land masses b. patterns in the geographical distribution of species c. patterns of species dispersal d. patterns of population demographics e. the biodiversity of plant and animal species
Which events below are thought to allow p53 to direct a cell into apoptosis?
a) binding of p53 to proteins that directly trigger mitochondrial membrane permeabilization and release of apoptotic factors b) activation of the expression of the BAX gene c) all of the choices are correct d) binding of p53 to several members of the Bcl-2 family proteins