Biology Questions and Answers
- Which are the subproducts
of the photochemical stage
that are essential for the
chemical stage of
photosynthesis?
The chemical stage odepends on NADPH af photosyntnd ATP produced inhesis (^)
the “light reactions” (photochemical
stage).
- What are the roles of
NADPH and ATP in the
chemical stage of
photosynthesis?
NADPH acts as reductant of carbon
dioxide, it delivers hihydrogens to precursor ghly energeticmolecules
during the glucose formation process.
ATP is an reactions of chemicalenergy sourc stage.e for the
- Why is the nickname “dark
reactions” not entirely correct
for the chemical stage of
photosynthesis?
“Dark rfor the chemical stage of photosynthesiseactions” is not a correct name (^)
since the reactions of the chemical
stage also occur in the presence of light.
- What is the general
chemical equation of
photosynthesis? Why doesn't
that equation clearly show the
real origin of the molecular
oxygen liberated?
The general equation of photosynthesis
is:
6 CO 2 + 6 H 2 O + light --> C 6 H 12 O 6 +
6 O 2.
Water molecules are the chemical stage of photosynthesis asalso produced in (^)
the following complete equation reveals:
(^6 6) HCO 2 + 12 H 2 O + light --> C 6 H 12 O 6 +
2 O + 6 O 2
Water molecules are reagent side as well in the product sidepresent in the (^)
of the equation. Pure mathematicalsimplification of stoichiometric
coefficients however leads to elimination
of water then seems that 6 from the product side molecules ofand it
molecular oxygen (O 2 ), i.e., 12 atoms of
oxygen, are made for each 6 mof water, i.e., 6 oxygen atoms, in theolecules
reagent side. Thus a false impression
that 6 dioxide is created.other oxygens come from carbon
- What are the three main
limiting factors of
photosynthesis?
The three main photosynthesis process arlimiting factors ofe light
intensity,and temperature. carbon dioxide concentration
http://www.biology-questions-and-answers.com