Which inefficiency arises when photorespiration outcompetes the carboxylation of RuBP by rubisco?

💡 Explanation

When photorespiration outcompetes carboxylation, oxygen binds to RuBP instead of carbon dioxide because rubisco's active site favours oxygen at high O₂/CO₂ ratios, reducing the production of 3-PGA, decreasing overall carbohydrate synthesis. Therefore, decreased carbohydrate synthesis results, rather than increased ATP, reduced water loss or enhanced nitrogen fixation which are unrelated.

• Which outcome directly results when diadromous fish encounter downstream osmotic gradient reversal?
• Which consequence occurs in soaring birds if calamus feathers experience increased wear?
• Which risk increases for birds relying on soaring flight when asymmetrical feather wear develops?
• Which risk sharply increases as albatross feathers degrade during an extended transoceanic foraging trip?
• Which risk increases when inefficient respiratory countercurrent exchange limits avian oxygen uptake during thermal soaring?
• Which endocrine regulation change delays or prevents ecdysis in arthropods during metamorphosis?