Prokaryotes lack organelles such as nucleoli, mitochondria, plastids, Golgi apparatus, and do not exhibit cyclosis.
原生物无细胞器，如仁、粒体、质体、高尔基体等，胞质环流。
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In prophase 2, we see the disappearance of the nucleoli and the nuclear envelope again as well as the shortening and thickening of the chromatids.
在前期 2，我们看到核膜消失，染色单体变短变厚。
Generally speaking, malignant cells are irregularly-shaped with darkly staining nuclei, enlarged nucleoli, and produce abnormal keratin that look like pearls - so they're called keratin pearls.
般来说，恶性肿瘤细胞形态各异且细胞核深染，伴有增大的核仁，还珍珠样的异角质——称作角化珠。
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划词翻译
详细解释
生物无细胞器，如
粒体、质体、高尔基体等，
胞质环流。
活医学科普 
般来说，恶性肿瘤细胞形态各异且细胞核深染，伴有增大的核仁，还
珍珠样的异
角质——称作角化珠。
