Discussion
The amino acid formation is dextro i.e. right rotating after an organism dies then, which one of the following is true ?
Answer: B
The usable fact is that the dextro to levo ratio can be determined for age.
This is amino acid racemisation dating. Living organisms build their proteins from L (levo) amino acids. After death the L forms slowly convert into their D (dextro) mirror images until the two reach equilibrium, at a rate that depends on time and temperature. Measuring the D/L ratio in a shell, bone or tooth therefore gives its age.
The absolute amount of D forms (option A) depends on how much amino acid survives, so it is the ratio that is measured. The method is clearly useful (C is wrong), and the conversion takes tens of thousands to millions of years, not a fixed 10,000 years (D).
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