Biology Forum Community General Discussion photosynthesis

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• #16818
Anonymous
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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!

• #112291
Cat
Participant

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…

• #119227
McKailah Harrison
Participant

Suppose you are measuring CO2 exchange by Elyse. During the time period of your measurement 2.10E+7 Molecules of glyeraldehyde phosphate are made from CO2 in photosynthesis and 3.00E+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?

• #119230
Bioexpert
Participant

According to stoichiometric calculations, 6 molecules of carbon dioxide are required, one for each carbon atom in glucose.

If 1.00E+6 molecules of glucose are being consumed, it will take 1 x 1.00E+6 = 6.00E+6 molecules of CO2.

• This reply was modified 1 week, 2 days ago by Bioexpert.

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