Which of the following statements about structural maintenance of chromosomes (SMC) proteins is true?
A. They have four distinct domains: N, C, and two ?-helical coiled-coil domains.
B. They are usually dimeric and dimerization forms the ATP-binding site.
C. Dimers of SMC proteins are all homodimers having identical subunits.
D. Dimerization of SMC proteins creates a molecule with two heads and two ATP-binding sites.
E. The ATP bound by SMC proteins is hydrolyzed before the heads come together in the dimer.
D
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