Question

if you tagged organic carbon inside a chloroplast with a fluorescent label, the location most likely to have a high concentration of labeled carbon would be in multiple choice thylakoid membrane inside the thylakoid stroma between the outer and inner membranes

Explanation:

Photosynthesis occurs in chloroplasts. The light - dependent reactions take place in the thylakoid membranes and the light - independent reactions (Calvin cycle) occur in the stroma. Organic carbon is fixed and accumulated during the Calvin cycle in the stroma. So, the stroma is likely to have a high concentration of the tagged organic carbon.

Answer:

Stroma