Covalent bonding is important between atoms of biological molecules, but other factors are important for self-assembly. For example, hydrogen bonds between base-pairs in DNA hold the two strands together.

The biomolecules are the macromolecules composed by the polymerisation of small units called monomers. Since the biomolecules are the molecules in which both the covalent and noncovalent bonds are present.

Both covalent and non-covalent bonds stabilize the structure of the biomolecule like in DNA the phosphodiester bond between the two nucleotides but the DNA also contain the non-covalent bonds like hydrogen bonds between the base pair which allows the complementary base pairing a stabilizes the helical structure of DNA.

Thus, True is the correct answer.