If Glucose, Radioactively Labeled in the C-2 Position with ¹⁴C

question 64

Multiple Choice

If glucose, radioactively labeled in the C-2 position with ¹⁴C, is used as a substrate in a yeast extract maintained under strictly anaerobic conditions, what is the location of ¹⁴C in the product ethanol?

• A) ¹⁴CH₃-CH₂-OH
• B) CH₃-¹⁴CH₂-OH
• C) CH₃-CHOH-¹⁴COO^-
• D) It is released as ¹⁴CO₂ by pyruvate decarboxylase and never becomes part of ethanol.
• E) It is released as ¹⁴CO₂ by alcohol dehydrogenase and never becomes part of ethanol.

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