Oxidation of optically active D-erythrose with nitric acid produces optically inactive meso-tartaric acid (below) .What is the structure of D-erythrose? 
Definitions:
Biological Preparedness
A concept in psychology that suggests organisms are innately predisposed to form associations between certain stimuli and responses.
Conditioned Taste Aversions
A learned aversion to a particular food or drink because it has been associated with an unpleasant or nauseating experience.
Heredity And Environment
The two principal factors that influence an individual's physical and psychological traits: genetic inheritance and external conditions or surroundings.
Behaviour Modification
A technique or intervention designed to change harmful or undesirable behaviors using principles of learning theory.
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