iBT TOEFL Topic Vocabulary Breakthrough Unit 060
Author: Li Xiaolai
60. Virus, infectious agent found in virtually all life forms, including humans, animals, plants, fungi, and bacteria, consist of genetic material — either deoxyribonucleic acid (DNA) or ribonucleic acid (RNA) — surrounded by a protective coating of protein, called a capsid, with or without an outer lipid envelope.Author: Li Xiaolai
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