iBT TOEFL Topic Vocabulary Breakthrough Unit 059

iBT TOEFL Topic Vocabulary Breakthrough Unit 059
Author: Li Xiaolai

59. Bacteria lack a true nucleus, a feature that distinguishes them from plant and animal cells. In plants and animals the saclike nucleus carries genetic material in the form of deoxyribonucleic acid (DNA). Bacteria also have DNA but it floats within the cell, usually in a loop or coil. A tough but resilient protective shell surrounds the bacterial cell.

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