A Researcher Is Carrying Out an Experiment Where She Labels

question 167

Multiple Choice

A researcher is carrying out an experiment where she labels a protein with a fluorescent tag (so she can visualize its location in a cell) , and introduces this tagged protein into the lumen of a single thylakoid. She observes her treated cells periodically, and notices that the labeled protein can move between grana, but is never observed in the stroma. What can she deduce?

• A)This protein can easily transfer between the inner and outer mitochondria membranes.
• B)All thylakoid membranes and grana share a common lumen, through which the labeled protein can move.
• C)This protein likely travels between different thylakoid membranes by moving through the stroma, but its movement through the stroma is very brief.
• D)This protein cannot easily diffuse through the thylakoid membrane.
• E)The protein likely travels through a common lumen shared by thylakoid membranes and grana, and cannot easily diffuse through the thylakoid membrane.

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