Question

what are the two phases of glycolysis? substrate preparation and product formation energy investment and energy yield activation and deactivation oxidative and non-oxidative stages

Explanation:

Glycolysis is the metabolic pathway that converts glucose into pyruvate. The two main phases of glycolysis are the energy investment phase (where ATP is used to phosphorylate glucose and its intermediates) and the energy yield phase (where ATP and NADH are produced). The option "substrate preparation and product formation" is not the standard terminology for glycolysis phases. "Activation and deactivation" is not related to glycolysis phase classification. "Oxidative and non - oxidative stages" is more associated with the pentose phosphate pathway rather than glycolysis. So the correct option is the one with "energy investment and energy yield".

Answer:

B. energy investment and energy yield (assuming the options are labeled A, B, C, D with A being "substrate preparation and product formation", B being "energy investment and energy yield", C being "activation and deactivation", D being "oxidative and non - oxidative stages")