Calvin Cycle

CALVIN CYCLE The Calvin Cycle

makes sugar from the atoms in CO2 plus the H+ ions and electrons carried by NADPH.

The Calvin Cycle takes place in the stroma

The Calvin Cycle uses the ATP that was created in the Light Reactions to make sugar.

CALVIN CYCLE Carbon fixation: carbon

dioxide is added to (fixed) into an existing 5 carbon sugar. It splits into 3 carbon sugars.

The electrons and H+ ions from NADPH are added to the 3 carbon sugars forming G3P. ATP is needed.

One G3P molecule leaves the cycle, it is the building block of glucose and other organic molecules.

The G3P is turned back into RuBP (the 5 carbon sugar we started with). ATP is required.

CALVIN CYCLE Inputs: CO2, NADPH, ATP Outputs: C6H12O6 (sugar) The sugar can be converted to sucrose,

starch or cellulose. Leaf cells can export sucrose thru veins to

supply the rest of the plant with energy The sugar can be converted to starch, which

the plant can use during the night for energy. The carbon skeletons can be used to form

lipids, proteins, and other molecules the plant needs for growth or maintenance.

PHOTOSYNTHESIS

6CO2 +12 H2O C6H12O6 + 6O2 + 6H2O

CONVERTING SUNLIGHT TO SUGAR Complete Reflect & Connect #1-5 on

page 334 Read “Photosynthesis Isn’t Just For

Plants” p. 335.Why? Because it’s interesting and you’ll be

able to impress your friends at parties Plus, I’ll put a bonus question on the next

quiz from this reading.