[TOEFL iBT] Detail Identification Trap Dissection | AceThePrep

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Audio Transcript Excerpt: PROFESSOR: 'In plant biochemistry, C4 photosynthesis represents a remarkable evolutionary convergence to circumvent photorespiration. In standard C3 plants, the enzyme RuBisCO frequently binds oxygen instead of carbon dioxide when ambient temperatures rise, generating the toxic byproduct 2-phosphoglycolate which costs significant metabolic energy to salvage. C4 plants like maize and sugarcane solve this by physically segregating carbon fixation across two distinct cell types: mesophyll cells and bundle sheath cells. In mesophyll cells, PEP carboxylase—which has zero affinity for oxygen—fixes bicarbonate into oxaloacetate, which is reduced to malate and shuttled into bundle sheath cells where CO2 is concentrated around RuBisCO.'

According to the professor, why does PEP carboxylase avoid the photorespiratory trap that plagues RuBisCO?

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Practice More TOEFL iBT Detail Identification Questions

More Detail Identification Questions in TOEFL iBT

Practice More TOEFL iBT Detail Identification Questions

More Detail Identification Questions in TOEFL iBT