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,whereas organelles in the lighter fraction could produce ATP in the dark.The heavier and lighter fractions are most likely to contain,respectively,
A)mitochondria and chloroplasts.
B)chloroplasts and nuclei.
C)peroxisomes and chloroplasts.
D)chloroplasts and mitochondria.
E)mitochondria and peroxisomes.

Question

Quizplus · Accepted Answer

Chloroplasts, which are heavier due to their size and density, can produce ATP in the light through photosynthesis. Mitochondria, which are lighter, produce ATP in the dark through cellular respiration.

A Biologist Ground Up Some Plant Leaf Cells and Then