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IBDP Biology- Calvin cycle

Topic 2- Photosynthesis

· IBDP BIOLOGY

In this IBDP Biology blog post, we will learn:

  • The recap of photosynthesis
  • The detailed process of the Calvin cycle

Photosynthesis  

Photosynthesis: Is a metabollic pathway. Carbon dioxide along with water is used to produce carbohydrates. Oxygen is released as a waste gas 

6CO2 + 6H2O _______________ C6H12O6 + 6O2

Photosynthesis occurs in a Chloroplast

Stroma: Light independent reactions

  • 70S ribosomes and naked DNA

Thylakoid membranes: Light dependent reactions

  • Starch grains and oil droplets are products of photosynthesis and acts as chemical energy stores  

Steps of the Calvin cycle  

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  • RuBP a 5 carbon compound binds to an incoming carbon dioxide molecule in a process called carbon fixation.
  • This fixation is catalysed by the enzyme Rubisco. The result is an unstable 6 carbon compound
  • The unstable 6 carbon compound breaks down into two 3-carbon compounds called glycerate 3 phosphate
  • The 3 carbon molecules of GP are acted upon by ATP and NADPH from the light dependent reacton to form two other 3 carbon molecules called Triose Phosphate. This is a reduction reaction
  • The molecules of TP may go in either two directions. Some leave the cycle to become sugar phosphates that may become more complex carbohydrates. 
  • Most however continue in the cycle to reproduce the origniating compound of the cycle RuBP
  • In order to regain RuBP molecules from TP the cycle uses ATP 

That's all!

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References:

https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.khanacademy.org%2Fscience%2Fap-biology%2Fcellular-energetics%2Fphotosynthesis%2Fa%2Fcalvin-cycle&psig=AOvVaw2xySy-1I7cbSgr7PeaqPrq&ust=1627830509807000&source=images&cd=vfe&ved=0CAsQjRxqFwoTCMCk2azLjfICFQAAAAAdAAAAABAD

Drafted by Venetia (Biology)

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IBDP Biology- Light Dependent Reactions (1/2)
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