Rubisco is an important enzyme in the Calvin cycle. It catalyzes the addition of
ID: 68297 • Letter: R
Question
Rubisco is an important enzyme in the Calvin cycle. It catalyzes the addition of carbon dioxide and water to ribulose-1.5-bisphosphate, which then forms two molecules of 3-phosphoglycerate. Rubisco acts as a carboxylase and is essential for carbon fixation. Rubisco has an additional function. It can also function as an oxygenase. What is/are the product(s) of the reaction when rubisco acts as an oxygenase? Briefly explain how a C_3 plant deals with the product(s) of the reaction when rubisco acts as an oxygenase. phosphoglycerato C is Fixed on mesophy and released to bynde sheath alls that are isolated from the In addition to the answer in no. 9, briefly describe the other two strategies have plants developed coping with rubisco's wasteful oxygenase activity. Glycolate pathway, light dependent, CO_2 released O consumed The oxygenase activity of rubisco is particularly a problem for plants in arid environments. If offsets the O_2:CO_2 ratio is so they close their stomata to prevent water cross during the day. T uparrow, CO_2 solubility water photolysis what does this do?Explanation / Answer
A) phosphoglycolate and phosphoglycerate
When Co2 concentration drop RUBISCo facilitate the binding of oxygen with RUBP and produce one molecule of PGA and one molecule of phosphoglycolate..I.e 2carbon compound..in other words switch to c 2 cycle.
B) c4 cycle ..in which Calvin cycle occur in bundle sheath cell instead of mesophyll cell..escape rubisco from photorespiration.
CAM pathway..occur in desert plants..where Calvin occur in day when stomata is close to conserve water.
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