photosynthesis

[meygancloe]

Suppose that you are measuring CO2 exchange by a leaf. During the time period of your measurement, 1.20E+7 molecules of glyeraldehyde phosphate (PGAL) are made from CO2 in photosynthesis and 1.00E+6 molecules of glucose are used in cellular respiration. How many net molecules of CO2 would you detect being taken up by the leaf in your measurement?

help needed, im so clueless!

[Cat]

This is a math problem. Glucose is 6 carbons and Glyceraldehyde is 3 carbons. So, you need 9 CO2 molecules to make 1 of each of these. You can calculate the rest...