ATP is the main energy transporter within the cell.
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A lac repressor turns off the lac genes by binding to the
operator
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ATP hydrolysis
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Myosin heads bind to the actin binding site, and also has a part
where ATP binds
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when the ATP has been broken down to ADP, the ADP is released
from the binding site in the protein and the binding site may then
be filled by another ATP molecule.