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 radiolabeled ¹⁴CO₂ enters the cyanelle and if, subsequently, radiolabeled glucose is present in cercozoan cytosol.
E) If radiolabeled "heavy" water, ²H₂O, enters the cyanelle and if, subsequently, radiolabeled oxygen appears in cercozoan cytosol.

Question

Quizplus · Accepted Answer

The best evidence that the cyanelles are providing nutrition to the cercozoan would be if radiolabeled ¹⁴CO₂ enters the cyanelle and if subsequently, radiolabeled glucose is present in the cercozoan cytosol. This would indicate that the cyanelle is performing photosynthesis and providing nutrients to the surrounding cell. Option A talks about aerobic photosynthesis, which is not relevant to this context. Option B talks about glucose transport proteins which may indicate transport but not the presence of nutrients. Option C talks about aerobic respiration which is not relevant to the cyanelle's function. Option E talks about "heavy water," which is not relevant to this context as it does not provide any information about the photosynthetic process.

If True, Which of the Following Is the Best Evidence