If Glucose Labeled with ¹⁴C at C-1 Were the Starting

Multiple Choice

If glucose labeled with ¹⁴C at C-1 were the starting material for amino acid biosynthesis, the product that would be readily formed is:

A) serine labeled at the carboxyl carbon.
B) serine labeled at alpha carbon.
C) serine labeled at the R-group carbon.
D) All of the answers are correct.
E) None of the answers is correct.