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.  

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explanation:

the abdomen (less formally called the belly, stomach, tummy or midriff) constitutes the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. the region occupied by the abdomen is termed the abdominal cavity. the stomach secretes acid and enzymes that digest food. ridges of muscle tissue called rugae line the stomach. the stomach muscles contract periodically, churning food to enhance digestion. the pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.