生物专业英语第三版蒋悟生编 课文翻译

生物专业英语第三版蒋悟生编 课文翻译--

Inside the Living Cell: Structure and Function of Internal Cell Parts

Cytoplasm: The Dynamic, Mobile Factory

细胞质：动力工厂

Most of the properties we

associate with life are

properties of the cytoplasm. Much of the mass of a cell consists of this semifluid

substance, which is bounded on the outside by the plasma membrane. Organelles are suspended within it, supported by the filamentous

network of the cytoskeleton. Dissolved in the

cytoplasmic fluid are nutrients, ions, soluble proteins,

and other materials needed for cell functioning.

生命的大部分特征表现在细胞质的特征上。细胞质大部分由半流体物质组成，并由细胞膜（原生质膜）包被。细胞器悬浮在其中，并由丝状的细胞骨架支撑。细胞质中溶解了大量的营养物质，离子，可溶蛋白以及维持细胞生理需求的其它物质。

The Nucleus: Information Central

（细胞核：信息中心） The eukaryotic cell nucleus is the largest organelle

and houses the genetic material (DNA) on

chromosomes. (In prokaryotes the hereditary material

is found in the nucleoid.) The nucleus also contains one or two organelles-the

nucleoli-that play a role in cell division. A pore-perforated sac called the nuclear

envelope separates the nucleus and its contents from the

cytoplasm. Small molecules can pass through the

nuclear envelope, but larger molecules such as mRNA

and ribosomes must enter and exit via the pores.

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