describe mechanisms' by which extra cellular material may enter a cell.?
Explain how a carbon atom taken in b y such a plant may later appear in a molecule of ribulose bisphoshate and indicate three othe possible fates of this carbon atom.
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during the Calvin cycle, Carbon is fixed. This means that carbon atoms (from carbon dioxide) are added to other molecules. It happens to be added to ribulose 1,5-bisphosphate (RuBP). As the calvin cycle turns, this atom can:
1)
be removed from the cycle as part of a glyceraldehyde 3-phosphate (GALP) molecule which is converted into fructose 6-phosphate
2)
continue round to cycle again and be recycled into a a RuBP molecule (it has 5 carbons)
fructose 6-phosphate is isomerised into glucose 6-phosphate and de-phosphorylated into glucose.
Glucose can be used to make any number of carbohydrates such as starch or cellulose. If it is also isomerised into other isomeric forms (such as galactose). It can form other sugars such as lactose (Glu - Gal).