In biological systems weak bonds are being continually
broken and refomed without the aid of enzymes. Compare this to covalent bonds
. Weak bonds may be easily broken but they are very important because they help to determine and stabilize the shapes of biological molecules. For example they are important in stabilizing the secondary structure (alpha helix and beta peated sheat) of proteins. Hydrogen bonds keep complementary strands of DNA together. Hydrogen bonds participate in enzymic catalysis.
return to strong bonds