If true, which of the following is the best evidence that the cyanelles are providing nutrition (in other words, calories)to the surrounding cercozoan?
A)if the cyanelle performs aerobic photosynthesis
B)if the vesicle membrane that surrounds each cyanelle possesses glucose-transport proteins
C)if the cyanelle performs aerobic respiration
D)if radiolabelled ¹⁴CO₂ enters the cyanelle and if, subsequently, radiolabelled glucose is present in cercozoan cytosol
E)if radiolabelled "heavy" water, ²H₂O, enters the cyanelle and if, subsequently, radiolabelled oxygen appears in cercozoan cytosol

Question

Quizplus · Accepted Answer

The presence of radiolabelled glucose in the cercozoan cytosol after radiolabelled ¹⁴CO₂ enters the cyanelle indicates that the cyanelle is performing photosynthesis and providing nutrition to the host. This is because during photosynthesis, carbon dioxide is converted into glucose, which can be used as a source of energy by the host organism. Option A is incorrect because aerobic photosynthesis is not a known metabolic process. Option B is not sufficient evidence as glucose-transport proteins are found in many cellular membranes. Option C is not indicative of nutrition transfer from cyanelles to cercozoans as aerobic respiration occurs in both organisms. Option E is irrelevant as it does not provide evidence of nutrition transfer.

If True, Which of the Following Is the Best Evidence