The chromonema is derived by the union of chromosomes in prophase, and during interkinesis the chromosome is represented by a double chain of chromomeres. From the evidence of karyomeres in animal cells, the nucleus is regarded as a compound structure, and it was further suggested that the ...
A. nucleus B. mitochondria C. endoplasmic reticulum D. cytoplasm 相关知识点: 试题来源: 解析 A。细胞的结构主要由细胞核决定。细胞核控制着细胞的遗传和代谢活动,对细胞的结构和功能起着关键作用。线粒体主要提供能量,内质网参与蛋白质合成和运输,细胞质是细胞内各种细胞器和物质的载体,但它们都不是决定细胞...
Chromosomes are the most important parts of the cell nucleus. Each chromosome has two components: 1) an axis formed by protein fibers, and 2) long loops of a molecule called DNA that hang off of the chromosome’s axis. There are 46 chromosomes in each human cell. Each chromosome is plast...
Nucleus Structure The nucleus of the cell is a membrane-bound organelle that includes the nuclear envelope, nucleolus, and nuclear matrix, and is the site of gene expression. The nucleus can be selectively visualized by staining nuclear proteins or directly staining nucleic acids. Here we describe...
Nucleus Structure The nucleus of the cell is a membrane-bound organelle that includes the nuclear envelope, nucleolus, and nuclear matrix, and is the site of gene expression. The nucleus can be selectively visualized by staining nuclear proteins or directly staining nucleic acids. Here w...
7.60 Cell Biology: Structure and Functions of the Nucleus, Spring 2010 The goal of this course is to teach both the fundamentals of nuclear cell biology as well as the methodological and experimental approaches upon which they... P Sharp,R Young 被引量: 2发表: 2010年 7.60 Cell Biology: ...
The structure that controls the movement of substances in and out of a cell is the ___. A. cell wall B. cell membrane C. cytoplasm D. nucleus 相关知识点: 试题来源: 解析 B。本题考查细胞结构。“cell membrane”即细胞膜,控制物质进出细胞。“cell wall”细胞壁主要起支持和保护作用。“cytopla...
Organelle, any of the specialized structures within a cell that perform a specific function (e.g., mitochondria, ribosomes, endoplasmic reticulum). Organelles in unicellular organisms are the equivalent of organs in multicellular organisms. The contracti
As it was pointed out during the opening lecture of the Workshop, we had several anniversaries in 2003, which are concerned with the cell nucleus. The 50 years of the double helix paper have been celebrated all over the world, but two others are worth mentioning: the paper by Cogliati ...
Nucleus, in biology, a specialized structure occurring in most cells (except bacteria and blue-green algae) and separated from the rest of the cell by a double layer, the nuclear membrane. The nucleus controls and regulates the activities of the cell (e.