AP BIOLOGY

Detailed explanation-1: -The oxidative photosynthetic carbon cycle (or C2 cycle) is the metabolic pathway responsible for photosynthetic oxygen uptake and the light‐dependent production of carbon dioxide that is termed photorespiration. The C2 and reductive C3 cycles coexist, and combined, represent total photosynthetic carbon metabolism.

Detailed explanation-2: -In the peroxisomes, glycolate is oxidized with O(2) uptake to glyoxylate by glycolate oxidase, and the glyoxylate is converted to glycine by glutamate:glyoxylate aminotransferase.

Detailed explanation-3: -Glycine is converted to serine and CO2 in the mitochondria. The serine thus formed is converted to glycerate, through a series of reactions which occurs in the peroxisome. Hence, option D is correct.

Detailed explanation-4: -The C2 cycle is light-dependent, known as the oxidative photosynthetic or carbon cycle or C2 cycle. The other name for the C2 cycle is photorespiration. It occurs in the chloroplasts. Under high concentrations of oxygen, the carbon dioxide that is fixed is lost.