In biology, the central, membrane-enclosed part of a eukaryotic cell, containing threads of DNA. It is found in both plant and animal cells. During cell division the threads of DNA coil up to form chromosomes. The nucleus controls the function of the cell by determining which proteins are produced within it. It is where inherited information (see inheritance) is stored as genes. Because proteins are the chief structural molecules of living matter and, as enzymes, regulate all aspects of metabolism, it may be seen that the genetic code within the nucleus is effectively responsible for building and controlling the whole organism.
The nucleus contains the nucleolus, the part of the cell where ribosomes are produced. Movement of molecules into and out of the nucleus occurs through the nuclear pores. An average mammalian nucleus has approximately 3,000 pores.
Function of cell structures
Cell Structures and Functions
inside the human body
RNA and protein synthesis
The organelle in eukaryotic cells making about 10% of the cell volume and containing the cell's CHROMOSOMES (see Fig. 20 ). In the...
Within a eukaryotic cell: a membrane-limited body which contains e.g. CHROMOSOMES and one or more nucleoli (see NUCLEOLUS ). (See also ...
From the Latin, meaning kernel . 1 The central portion of an atom. 2 A spherical structure within the cytoplasm of most cells...