The three-dimensional conformation of biomolecules is of the utmost importance in their interactions; for example, in the binding of a substrate (reactant) to the catalytic site of an enzyme (Fig. 3-8), the two molecules must fit each other closely, in a complementary fashion, for biological function.
DD&A stands for Depletion, Depreciation and Amortization. Suggest new definition. This definition appears frequently and is found in the following Acronym Finder categories: Business, finance, etc.
Accidental death and dismemberment insurance. AD&D redirects here. For the updated version of the original 1974 Dungeons & Dragons rule set, see Advanced Dungeons & Dragons. In insurance, accidental death and dismemberment (AD&D) is a policy that pays benefits to the beneficiary if the cause of death is an accident. This is a limited form of life insurance which is generally less expensive. 1 Accidental death 1.1 Common exclusions.