A body of specialized protoplasm found in nearly all cells and containing the chromosomes.
The usually spherical body with each living cell that contains its hereditary biological material (e.g., DNA, genes, chromosomes, etc.) and controls the cell’s life functions (e.g., metabolism, growth, and reproduction). The nucleus is a highly differentiated, relatively large organelle lying in the cytoplasm of the cell. The nucleus is surrounded by a (nuclear) membrane which is quite similar to the plasma (cell) membrane; except the nuclear membrane contains holes or pores. It is characterized by its high content of chromatin, which contains most of the cell’s DNA. That chromatin is normally (when cell is not in process of dividing) distributed throughout the nucleus in a diffuse manner.
Typically, the largest structure within cells. The contains DNA, RNA, and, usually, a distinct body called the nucleolus.
A central part which has others grouped or built around it.
The central body in a cell, which contains DNA and RNA and controls the function and characteristics of the cell.
A group of nerve cells in the brain or spinal cord.
An organelle in the cell containing DNA, the genetic material plus the enzymes, coenzymes, and cofactors needed to synthesize mRNA, which transfers genetic messages from the DNA to the ribosome where proteins are synthesized.
Usually spherical structure, enclosed in a membrane (the nuclear membrane), and contained within a cell, that controls the cell and its functions. It contains the genetic information for the maintenance, growth, and reproduction of the organism.
The central body of the cell that determines its functions.
The center portion of a living cell that contains DNA (deoxyribonucleic acid) and RNA (ribonucleic acid). The nucleus of a cell controls its metabolism, growth, and reproduction. The nucleus is separated from the surrounding cytoplasm by a double membrane called a nuclear envelope.
The part of a cell that contains the genetic material, DNA. The DNA, which is combined with protein, is normally dispersed throughout the nucleus as chromatin. During cell division the chromatin becomes visible as chromosomes. The nucleus also contains RNA, most of which is located in the nucleolus. The nucleus is separated from the cytoplasm by a double membrane, the nuclear envelope.
The central body in a cell, which controls the activities of the latter.
A central point about which matter is gathered, as in a calculus.
Dense, active protoplasm found in the center of the cell; plays an important part in cell reproduction and metabolism.
The core region of an atom, bearing a positive charge and containing nearly all of the atom’s mass. The nucleus comprises protons and neutrons, collectively referred to as nucleons, with the exception of the hydrogen nucleus, which consists of a solitary proton. It is also known as the atomic nucleus.
The main foundation or focal point present in various objects or structures.
The cell’s nucleus is a roundish entity located at its center. This nucleus holds the chromosomes, primarily made of nucleic acid, which guide the cell’s functions. A membrane encases the nucleus, featuring tiny openings that allow certain materials to move between the nucleus and the cell’s surrounding fluid, called cytoplasm. Typically, a nucleus contains a single nucleolus, a more condensed area without a membrane, involved in producing proteins.
A nerve nucleus is a collection of nerve cells, or neurons, in the brain and spinal cord that collaborate to carry out a specific function.
The atom’s nucleus consists of protons and neutrons, making up nearly all of the atom’s mass but occupying only a minuscule part of its volume. Changes within the atomic nuclei produce nuclear energy.