Because It Is Easy to Spot Meteorites Against White Snow

question 33

Multiple Choice

Because it is easy to spot meteorites against white snow and ice, Antarctica is a place where teams of scientists routinely go to search for them.When a meteorite found in Antarctica is analyzed and found to contain amino acids, scientists should exercise caution before claiming that the molecules are evidence that life came to Earth from other planets.Which statement best applies in this situation?

• A) The amino acids must be an equal mixture of d- and l-isomers to be considered evidence of life.
• B) The molecules should include all 20 standard amino acids found in living organisms on Earth.
• C) Organic molecules on the meteorite may be from Earth organisms that contaminated it after it fell to Earth.
• D) The extreme cold of Antarctica could have favored unusual chemical reactions in the meteorite before it was picked up.
• E) Exposure to the sun as the meteorite lay on the snow and ice could increase the likelihood that organic molecules would form on it.

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