During DNA replication in E. coli, what is the role of DnaA?
A) DnaA is a region of DNA recognized by the replisome where replication is initiated.
B) DnaA bends DNA, hydrolyzing the hydrogen bonds in the 13-mer region of oriC and creating an open complex.
C) DnaA is a helicase that uses ATP to hydrolyze hydrogen bonds and separate DNA strands.
D) DnaA carries the helicase protein to the open region of DNA where hydrolysis and strand separation will occur.
E) DnaA prevents reannealing of the separated strands so replication can proceed.
B
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In the absence of ATP synthase, animal cells would not be able to ____
a. create a proton gradient b. hydrolyze glucose to G3P c. carry out oxidative phosphorylation d. produce ATP e. carry out pyruvate oxidation
What percent of the ATP in a typical animal cell is consumed by the Na+-K+ pump?
a. 1% b. 10% c. 25% d. 66%
Studying the changes in densities of pocket gophers when large herbivores such as elk are excluded from mountain forests would be an example of studying ecology at which level?
A) population B) ecosystem C) community D) biosphere
Of the following modes of HIV transmission, which is the least common mode and rare in many countries?
A. needle sharing among IV drug users B. vaginal/rectal intercourse with an infected person C. oral-genital contact with an infected person D. transfusions of infected blood E. babies born to HIV-infected women