Debate and discussion of any biological questions not pertaining to a particular topic.
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The D refers to the optical activity of the molecule. Some organic compounds cause the polarization direction of plane-polarized light to rotate. D compounds (from dextro, or right) are those that rotate the polarization plane clockwise when viewed from the position of the light source. Amino acids are mostly L compounds (from levo, or left). Compounds that rotate plane polarized light contain chiral centers.
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