In 1969, Scientists Shaved Off Pieces of the Murchison Meteorite

question 222

Multiple Choice

In 1969, scientists shaved off pieces of the Murchison meteorite and found both D- and L-isomers of ten amino acids.Only L-isomers of amino acids are made by living organisms on Earth.This indicates that

• A) Earth's amino acids could not have had an extraterrestrial origin.
• B) the meteorite's amino acids as a whole could not have resulted from contamination by Earth organisms.
• C) basic chemical building blocks of life have only formed on Earth.
• D) life must have originated somewhere other than Earth.
• E) life arose in many places besides Earth.

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