Consider the production of the glucose in a blade of grass (a plant). a) Fill in
ID: 1033827 • Letter: C
Question
Consider the production of the glucose in a blade of grass (a plant). a) Fill in the blanks below for the production of the glucose from CO2, and H2O: ___CO2 + ___H2O à C6H12O6 + ___O2 b) How many electrons will need to move through the photosynthetic electron transport chain to produce enough reducing power to accomplish this? c) How many photons will be needed to power this many electrons? d) Assuming the photons are at 690 nm, what is the energy in kJ/mole that is available from the number of photons you stated in part d? e) How many NADPH will be made from this many photons? f) How many protons will be pumped by the b6f complex when the number of electrons you determined in part c pass through the photosynthetic electron transfer chain? Don’t worry about protons associated with water production or NADPH production. g) If you assume that the chloroplast ATP synthase has 14 c-subunits and that all of these protons are used to make ATP, how many ATP molecules will be made? h) If you assume that the number of protons pumped in part f are being pumped against a pH gradient of 3.5 pH units, how much energy does it take to pump those protons (in kJ/mole) at 25 C? Assume no electrical gradient. i) Considering only the energy of the 690 nm photons needed to generate the reducing power to make glucose (part d) and the literature value of the heat of combustion of glucose (-2805 kJ/mole), determine the overall energy efficiency of converting the energy of 690 nm light into a mole of glucose.
Explanation / Answer
a) 6Co2+6H2O------->C6H12O6+6O2 b)capturing one carbon dioxide requires 4 electrons, so for 6CO2 molecules require 24 electrons. c)for capturing one CO2 molecule 8 photons requires so 48 photons require for above reaction. e) for oneCO2 requires 2NADPH So 12 NADPH are required for these 48 photons.
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