A biologist ground up some plant leaf cells and then centrifuged the mixture to fractionate the organelles. Organelles in one of the heavier fractions could produce ATP in the light, while organelles in the lighter fraction could produce ATP in the dark. The heavier and lighter fractions are most likely to contain, respectively,

Question

Quizplus · Accepted Answer

The organelles that can produce ATP in the light are most likely chloroplasts, which contain the pigment chlorophyll and are responsible for photosynthesis. The organelles that can produce ATP in the dark are most likely mitochondria, which are responsible for cellular respiration. Therefore, the heavier fraction likely contains chloroplasts, while the lighter fraction likely contains mitochondria.

A Biologist Ground Up Some Plant Leaf Cells and Then