In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
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Question: A receptor antagonist is a biological repressor molecule .

Answer: A receptor antagonist is a type of receptor ligand or drug that blocks or dampens a biological response by binding to and blocking a receptor rather than activating it like an agonist .

Question: It is the only tower to be in the fire zone to survive .

Answer: The tower was the only public building in the burned zone to survive , and is one of just a few of the surviving structures still standing .

Question: The iPhone 6S and iPhone 6S Plus are two smartphones designed by Apple Inc .

Answer:
The iPhone 6S and iPhone 6S Plus ( stylized and marketed as iPhone 6s and iPhone 6s Plus ) are smartphones that were designed , developed , and marketed by Apple Inc .