Question

Beginning with carbon fixation, arrange the steps of the Calvin cycle in the correct order.

use of enzyme and ATP to form 5-carbon compound

formation of a stable 3-carbon compound

carbon dioxide reacts with a 5-carbon compound

use of ATP to form a high-energy 3-carbon compound

formation of an unstable 6-carbon compound

formation of glucose, which leaves the chloroplast

Answer 1

1. Carbon dioxide reacts with a 5-carbon compound
2. formation of an unstable 6-carbon compound
3. formation of a stable 3-carbon compound
4. use of ATP to form a high-energy 3-carbon compound
5. use of enzyme and ATP to form 5-carbon compound
6. formation of glucose, which leaves the chloroplast

Step-by-step explanation:

During Calvin cycle a CO2 molecule reacts with a 5-carbon compound, ribulose-1, 5-bisphosphate (RuBP) to form a 6-carbon unstable compound which splits into two molecules of 3-carbon stable compound, 3-phosphoglyceric acid (3-PGA). With the help of ATP and NADPH, the 3-PGA molecules form a high-energy 3-carbon compound, 3-phosphoglyceraldehyde (3-PGAL). Some molecules of the 3- phosphoglyceraldehyde (3-PGAL) are used to regenerate 5-carbon, ribulose-5- phosphate and some of the molecules of 3- phosphoglyceraldehyde (3-PGAL) are used to form glucose.