Drag the terms on the left to the appropriate blanks on the right to complete th
ID: 67577 • Letter: D
Question
Drag the terms on the left to the appropriate blanks on the right to complete the sentences. Terms can be used once, more than once, or not at all. Carbon dioxide concentration is suddenly reduced 1000-fold. With little or no carbon dioxide on hand to generate from the former will decrease in concentration and the latter will accumulate. Light is restricted to green wavelengths (510 - 550 nm). In the presence of green light only there will be little or no ATP and to drive the reduction of PGA to from which RuBP is regenerated. An inhibitor of photosystem II is added. The products of the light-dependent reactions are required to keep the Calvin cycle functioning, and an inhibitor of photosystem II will effectively the formation of NADPH and will almost certainly the formation of ATP as well. Oxygen concentration is reduced from 20% to 1%. Decreased oxygen availability will lessen the oxygenase activity of thereby allowing more net carboxylation and hence PGA formation. RuBP is being used for carboxylation and for oxygenation.Explanation / Answer
Carbon dioxide concentration is suddenly reduced 1000-fold. With little or no carbon dioxide on hand to generate PGA from RuBP, the former will decrease in concentration and the latter will accumulate.
Description: In carbon fixation, RuBP takes CO2 and forms PGA if there is no CO2 then the further reaction will not take place.
Light is restricted to green wavelengths (510-550). In presence of green light only there will be little or no ATP and NADPH to derive the reduction of PGA to glyceraldehyde-3-phosphate from which RuBP is regenerated.
Description: This regeneration reaction requires ATP and NADPH both.
An inhibitor of photosystem II is added. The products of the light-dependent reactions are required to keep the calvin cycle functioning, and an inhibitor of photosystem II will effectively reduce the formation of NADPH and will almost certainly reduce the formation of ATP as well.
Description: Both are formed in PS II so if this is inhibited then formation of both will be stopped.
Oxygen concentration is reduced from 20 to 1%. Decreased oxygen availability will lessen the oxygenase activity of rubisco. Thereby allowing more net carboxylation and hence more PGA formation. RuBP is being used more for carboxylation and less for oxygenation.
Description: Oxygenation is favored at high temperature which leads to photorespiration. In normal concentration carboxylation is favored.
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