Stomata, tiny pore structures in a leaf that absorb gases needed for plant growth, open when guard cells surrounding each
pore swell with water. In a pivotal 2007 article, plant cell ______ showed that lipid molecules called phosphatidylinositol
phosphates are responsible for signaling guard cells to open stomata.
biologist, Yuree Lee
biologist Yuree Lee,
biologist Yuree Lee
biologist, Yuree Lee,
Choice C is the best answer. The convention being tested is the use of punctuation between titles and proper nouns. No
punctuation is needed to offset the proper noun “Yuree Lee” form the title “plant cell biologist” that describes Lee.
Choice A is incorrect because no punctuation is needed. Choice B is incorrect because no punctuation is needed. Choice D
is incorrect because no punctuation is needed around the proper noun “Yuree Lee.” Setting the phrase off with punctuation
suggests that it could be removed without affecting the coherence of the sentence, which isn’t the case.