iBT TOEFL Topic Vocabulary Breakthrough Unit 051

iBT TOEFL Topic Vocabulary Breakthrough Unit 051
Author: Li Xiaolai

51. The components of cells are molecules, nonliving structures formed by the union of atoms. Small molecules serve as building blocks for larger molecules. Proteins, nucleic acids, carbohydrates, and lipids, which include fats and oils, are the four major molecules that underlie cell structure and also participate in cell functions.

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