A cell that has been fed glucose containing carbon - radioactive with carbon 14 in carbon #1 will have ________ percent of the radioactivity in each mole of glyceraldehyde-3-phosphate.

Question

Quizplus · Accepted Answer

When glucose containing carbon-14 in carbon #1 is fed to a cell, it enters the glycolytic pathway and eventually gets converted to two molecules of glyceraldehyde-3-phosphate. Each glucose molecule results in two molecules of glyceraldehyde-3-phosphate, and since there is only one carbon atom with carbon-14 in each glucose molecule, only one of the two molecules of glyceraldehyde-3-phosphate will contain carbon-14. Therefore, each mole of glyceraldehyde-3-phosphate will have 50% of the radioactivity in the original glucose. Hence, choice C (50%) is the correct answer.

A Cell That Has Been Fed Glucose Containing Carbon -