1. Prokaryotes are single-celled organisms that lack a defined nucleus.
原核生物是单细胞生物，缺乏明确定义的细胞核。

2. Bacteria are a type of prokaryote that can be found in various environments.
细菌是一种原核生物，可以在各种环境中找到。

3. Prokaryotes reproduce through binary fission, a process where the cell divides into two equal parts.
原核生物通过二分裂进行繁殖，这是一种细胞分裂成两个相等部分的过程。

4. Archaea is another type of prokaryote that can survive in extreme conditions.
古细菌是另一种可以在极端条件下生存的原核生物。

5. Prokaryotic cells do not have membrane-bound organelles like mitochondria or chloroplasts.
原核细胞没有像线粒体或叶绿体这样的膜结构细胞器。

6. Prokaryotes play a crucial role in various ecological processes, such as nutrient cycling and decomposition.
原核生物在各种生态过程中发挥着至关重要的作用，如养分循环和分解。