What is the function of Ribulose?
Correct answer: A. Intermediates in photosynthesis
- A. Intermediates in photosynthesis
- B. Respiratory fuel
- C. Intermediates in cellular respiration
- D. Component of DNA and RNA
Explanation
Ribulose is a type of sugar and is involved in several biological processes, particularly in the context of photosynthesis. The most notable role of ribulose is in the Calvin Cycle, which is the light-independent phase of photosynthesis that takes place in the stroma of chloroplasts. In the Calvin Cycle, ribulose plays a key role in the carbon fixation process. Ribulose-1,5-bisphosphate (RuBP), a five-carbon sugar, is crucial in the initial step of the Calvin Cycle. It combines with carbon dioxide (CO2) from the atmosphere with the help of the enzyme ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO). This reaction leads to the formation of an unstable six-carbon compound that immediately breaks down into two molecules of 3-phosphoglycerate (3-PGA), which are then used in the synthesis of carbohydrates.
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About Bioenergetics
Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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More Bioenergetics questions
First stable compound during Calvin cycle is:
RuBP + O2 ---Rubisco---> PGA + _ .
Where does the Calvin Cycle occur?
During photosynthesis, in the electron transport chain, ATP synthesis takes place when electrons move from:
Photophosphorylation takes place in the _ of the chloroplasts:
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