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...
Describe the structure of an atom.An atom consists of a nucleus, which contains protons and neutrons, surrounded by electrons. Protons have a positive charge, neutrons have no charge, and electrons have a negative charge. The number of protons determines
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.
Nuclear pore complexes (NPCs) are gateways for transport between the nucleus and cytoplasm of eukaryotic cells and play crucial roles in regulation of gene... E Ródenas,EP Klerkx,C Ayuso,... - 《Developmental Biology》 被引量: 54发表: 2009年 Hoxa9 Transduction Induces Hematopoietic Stem and ...
1 Which statement describes the structure of an atom? (3)(1)The nucleus contains positively charged electrons.(2)The nucleus contains negatively charged protons.(3)The nucleus has a positive charge and is surrounded by negatively charged electrons.(4)The nucleus has a negative charge and is sur...
On the fine structure of the nucleus in Trypanosoma cruzi in tissue culture forms. Spindle fibers in the dividing nucleus. J Protozool 21 : 48-52.De Souza W, Meyer H (1974) On the fine structure of the nucleus in Trypanosoma cruzi in tissue culture forms. Spindle fibers in the dividing...
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: ...
because they lackribosomes(cell organelles) for the translation of viralmessenger RNA(mRNA; a complementary copy of the nucleic acid of thenucleusthat associates with ribosomes and directs protein synthesis) into proteins. Viruses must use the ribosomes of their host cells to translate viral mRNA...
- 《Nuclear Physics A》 被引量: 10发表: 2011年 NUCLEAR STRUCTURE OF W-183 STUDIED IN (N,GAMMA), (N,N'GAMMA) AND (D,P) REACTIONS The nucleus W-183 was studied with (n, gamma), (n, gamma gamma) and (n, n'gamma) reactions at the Nuclear Research Center Reactor in Riga and ...
The total isospin T=1 is approximately a very good quantum number (>or∼96%). In He and n, energies are largely affected by the Coulomb potential and dependent on the model of the ΣN potential. The characteristic features of the nucleus-Σ potential are also discussed. (orig.) 展开 ...