Abiologist 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,

Chloroplast and mitochondria

Explanation:

Chloroplasts are organelles present only in plant cells and algae in regions that become illuminated. They are green in color due to the presence of chlorophyll and are responsible for photosynthesis. Chloroplasts produce ATP in the presence of sunlight and therefore the heaviest fractions should contain these organelles.

Mitochondria are cellular organelles related to the process of cellular respiration. They are often referred to as “powerhouses” of cells because, through the cellular respiration process, a large amount of ATP is generated. Mitochondria do not need light to produce ATP, so it is likely that these organelles are present in the lightest fractions.

answerhygroscopic;