Biochemistry stereochemistry

[El Curandero]

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Hi all,

So I know that all protoegenic amino acids are L steroechemistry, but what about carbohydrates? It seems like they all have D stereochemistry?

El Curandero

 

[Cawolf]

D only refers to the stereochemistry of the enantiomeric carbon farthest from the most oxidized carbon. In a Fischer projection it will be carbon 5 (with right facing OH group) in the common aldohexoses. It is true that naturally occurring sugars are the D isomer though.