Which of the Following Cannot Be Used as a Precursor

Question

Which of the following cannot be used as a precursor for gluconeogenesis?
A) Glycerol
B) Pyruvate
C) Lactate
D) Leucine
E) Alanine

Accepted Answer

Leucine is an amino acid that cannot be used as a precursor for gluconeogenesis. The other options (glycerol, pyruvate, lactate, and alanine) can all be converted into glucose through various metabolic pathways.