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Grammar question


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My first grader is writing about what he learned from a Magic School Bus episode. He's writing "DNA is the building blocks of life." He says Ms. Frizzle said it that way, not DNA are the building blocks and not DNA is the building block. I didn't watch the episode so I don't know what she said. Is there perhaps an exception for acronyms or maybe the show was wrong. What is grammatically correct?


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DNA stands fodeoxyribonucleic acid -- a singular noun. So "is" is correct, but the plural of "blocks" is incorrect as the sentence is currently constructed. For a grammatically correct sentence, either:

"DNA is a building block of life."
"DNA is one of the building blocks of life."

Edited by Lori D.
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