Question

if the pronoun in bold is vague, select all of the nouns or noun phrases it could refer to. if it is not vague, select its one clear antecedent. patrick brown, a former stanford university biochemistry professor, has created burger patties that use plant tissue to mimic animal tissue. according to the wall street journal, they smell like beef but taste more like turkey.

Explanation:

The pronoun "they" in the sentence refers to the noun phrase "burger patties" because "they" is used to describe the smell and taste of the burger patties that Patrick Brown created. There's no ambiguity here as "they" logically refers to the burger patties (the only plural noun phrase that makes sense in the context of having a smell and taste like the ones described).

Answer:

burger patties