Final answer:
Relatively weak interactions between macromolecules, such as hydrogen bonds, hold many cellular structures and molecules together.
Step-by-step explanation:
Loosely bind/_______molecule across
Relatively weak interactions between macromolecules, such as hydrogen bonds, hold many cellular structures and molecules together. In the case of DNA, hydrogen bonds between the complementary bases of the two DNA strands help maintain the stability of the double helix structure. These bonds are not localized between adjacent atoms but are spread over three or more adjacent atoms.
Therefore, the correct term to fill in the blank is hydrogen molecule.