The interactions between biomolecules are often stabilized by weak interactions such as hydrogen bonds. how might this be an advantage to the organism?

The answer is; They stabilize protein structures and, in addition, the weak interactions allow for reversibility.

They allow protein to be easily folded and unfolded without expending too much energy. An example is their significance in maintaining the alpha helices and beta sheets of proteins, and allowing for DNA to be easily unzipped for biochemical processes such as replication or duplication.

The interactions between biomolecules are often stabilized by weak interactions such as hydrogen bonds, this might be an advantage to the organism because bio-molecular interactions generally need to be reversible; weak interactions allow reversibility.