The brain's suprachiasmatic nucleus regulates the body's circadian rhythms. The suprachiasmatic nucleus is a minute region of the brain located in the hypothalamus above the optic chiasm, the circadian rhythm is the 24-hour cycle of organisms, related to sunlight and temperature.
In the dehydration synthesis reaction (attached) , two molecules of the sugar glucose (monomers) combine to form a single molecule of the sugar maltose (macromolecule)