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.
- bacteria [bækˈtiəriə] n.细菌
- lack [læk] v.缺乏
- feature [ˈfi:tʃə] n.特征
- distinguish [disˈtiŋɡwiʃ] v.区别
- saclike [ˈsæklaik] adj.囊状的
- genetic material [dʒiˈnetik - məˈtiəriərl] n.遗传物质
- deoxyribonucleic acid [di:ˌɔksi:ˌraɪbəʊnu:ˈkli:ɪk - ˈæsid] n.脱氧核糖核酸
- float [fləut] v.漂浮
- loop [lu:p] n.环
- coil [kɔil] n.(一)卷
- resilient [riˈziliənt] adj.有弹性的
- shell [ʃel] n.外壳
