Recent experimental observations have shown that quantum coherence plays an important role in photosynthetic energy transport. Photosynthetic molecules are large and complex, containing both regular structures, such as rings of chromophores, and apparently irregular structures. This talk proposes a general theory of the role of symmetry and asymmetry in quantum transport in biomolecules. I will show that collective coherent effects, including entanglement, can give rise to substantial enhancements of excitonic lifetimes and energy transport.