glyceraldehyde-3-phosphate (G3P)
One G3P molecule exits the Calvin Cycle after three turns.
Three turns of the Calvin Cycle are required to produce a G3P molecule that can be utilized in the synthesis of glucose.
Six turns of the Calvin Cycle are required to produce one molecule of glucose.
Six turns of the Calvin cycle are required to produce a molecule of glucose.
Dear friend, in Calvin cycle only two kinds of trioses (3C sugars) are formed. In fact, these are not sugars but phospoesters. One is phospoglyceraldehyde and second is dihydroxyacetone phosphate. These are isomers of each other.
Six turns of the Calvin Cycle are required to produce one glucose molecule.
Six turns of the Calvin Cycle are required to produce one molecule of glucose.
The Calvin cycle turns once during photosynthesis.
I'm pretty sure that it takes 2 PGAL's to make 1 glucose . It takes 6 turns of the Calvin cycle since 3 turns give you 1 PGAL.
One molecule of PGAL has 3 carbons in it (therefore three turns are necessary). Six molecules would therefore require 18 turns of the Calvin Cycle.
== == Technically speaking, three turns of the Calvin cycle produce one Glyceraldehyde-3-phosphate (G3P). Each turn of the Calvin Cycle uses 1 CO2. So three CO2 (3 cycles) for 1 G3P. Since 2 G3P are needed for 1 molecule of glucose = six molecules of CO2. As a side note, for one molecule of glucose= requires 6 CO2 + 18 molecules of ATP + 12 molecules of NADPH. (Source: Campbell and Reece, 2005)
One turn of the Calvin cycle requires 3 ATP with an addition of 2 NADPH. However, to produce 1 glucose molecule requires 6 turns of the Calvin cycle. 3 ATP per turn X 6 turns = 18 ATP Total 2 NADPH per turn X 6 turns = 12 NADPH Total Reference: Biochemistry, A short course by Tymoczko, Berg, Stryer. Page 354