What is a nucleus?

Answer 1

a part of the cell containing DNA and RNA and responsible for growth and reproduction
the positively charged dense center of an atom

Answer 2

Nucleus usually refers to the center of something, but can mean:

In science:

* Atomic nucleus, the collection of protons and neutrons in the center of an atom that carries the bulk of the atom's mass and positive charge
* Cell nucleus, the membrane-bound subcellular organelle found in eukaryotes, visible via microscopy, which contains, primarily, the cell's chromosomes
* Nucleus (neuroanatomy), a central nervous system structure composed mainly of gray matter that mediates electrical signaling within a particular subsystem
* Comet nucleus, the solid core of a comet
* Galaxy nucleus, the central region of a galaxy
* Ice nucleus, the center of an ice crystal
* Cloud condensation nuclei, the basis for the development of a cloud droplet

In linguistics:

* syllable nucleus, the central part of a syllable
* sentence nucleus, the syllable which receives the greatest stress in a word

In computer science:

* Nucleus CMS, an open-source weblog system
* Nucleus RTOS, a brand of operating system

In music:

* Nucleus (band), a British jazz-rock band led by Ian Carr

Answer 3

In chemistry, a nucleus is the centre of an atom made up of protons and neutrons. In biology, a nucleus is an organelle in a cell that acts as a reaction centre. It controls the activities of the cell by directing protein synthesis. The nucleus contains a smaller body called the nucleolus.

Answer 4

Nucleus usually refers to the center of something, but can mean:

In science:

Atomic nucleus, the collection of protons and neutrons in the center of an atom that carries the bulk of the atom's mass and positive charge
Cell nucleus, the membrane-bound subcellular organelle found in eukaryotes, visible via microscopy, which contains, primarily, the cell's chromosomes
Nucleus (neuroanatomy), a central nervous system structure composed mainly of gray matter that mediates electrical signaling within a particular subsystem
Comet nucleus, the solid core of a comet
Galaxy nucleus, the central region of a galaxy
Ice nucleus, the center of an ice crystal
Cloud condensation nuclei, the basis for the development of a cloud droplet

Answer 5

Nucleus: in physics, the extremely dense central core of an atom.

Atomic nuclei are composed of two types of particles, protons and neutrons, which are collectively known as nucleons. A proton is simply the nucleus of an ordinary hydrogen atom, the lightest atom, and has a unit positive charge. A neutron is an uncharged particle of about the same mass as the proton. The number of protons in a given nucleus is the atomic number of that nucleus and determines which chemical element the nucleus will constitute when surrounded by electrons.

The total number of protons and neutrons together in a nucleus is the atomic mass number of the nucleus. Two nuclei may have the same atomic number but different mass numbers, thus constituting different forms, or isotopes, of the same element. The mass number of a given isotope is the nearest whole number to the atomic weight of that isotope and is approximately equal to the atomic weight (in the case of carbon-12, exactly equal).


[Bush has been know to refer to this as the Nuculus - but don't listen to Bush - he rarely knows what he's talking about]

Answer 6

The center of an atom or cell. For example, like President Bush is the nucleus of chaos. lol

Answer 7

Hi Alan,
Nucleus in chemistry is the neutral particle central in an atom.

while the same is true with the cell in biology which contains the DNA.

Answer 8

the nucleus is a major centrally located spherical cellular component of cell.
it controls all the metabolic activities of cell.it also regulates the cell cycle and is responsible for the transmission of heriditary traits

Answer 9

The nucleus serves as the cell’s command center, sending directions to the cell to grow, mature, divide, or die. It also houses DNA (deoxyribonucleic acid), the cell’s hereditary material. The nucleus is surrounded by a membrane called the nuclear envelope, which protects the DNA and separates the nucleus from the rest of the cell. The nucleus contains most of the cell’s genetic material.

The nucleus is a dark structure located in the middle of the cell. It controls the cell's activities, and acts like the cell's brain. Inside the nucleus there is DNA which contains genetic information. The cytoplasm is a jelly-like substance inside the cell where most of the cell's activities take place. It's made out of water and other chemicals. All cell parts, except the nucleus, are located in the cytoplasm.

Kinds of nucleus :

Bose-Einstein nucleus (2 kinds, 11 facts) - Nucleus of even A-number (i.e., those with integral spin) (cf. Fermi-Dirac nuclei). Bose-Einstein nuclei do not obey the exclusion principle, and their ground state has zero angular momentum.

deuteron (6 facts) (d) - The nucleus of deuterium, an isotope of hydrogen. It consists of one proton and one neutron bound together., The nucleus of a deuterium atom. md = 2.01355 amu.

even-odd nucleus (3 facts) - Nucleus that contain even numbers of protons but odd numbers of neutrons.

Fermi-Dirac nuclei (2 facts) - Nuclei of odd A-number (i.e., nuclei that do not have integral spin) (cf. Bose-Einstein nuclei). Fermi-Dirac nuclei therefore obey the exclusion principle (q.v.).

isomer (2 facts) - Nucleus with the same A and Z numbers but in different energy states.

isotone (2 facts) - Nucleus with the same number of neutrons but with different A and Z numbers.

isotope (3 facts) - An atomic nucleus having the same number of protons as a more commonly found atomic nucleus but a different number of neutrons. For example, the hydrogen nucleus has a single proton; deuterium has one proton and one neutron and would be called an isotope of hydrogen. (see neutron; proton.), Two nuclei with the same number of protons but different numbers of neutrons are said to represent the same element, but different isotopes. For example, helium-3, with two protons and one neutron in each nucleus, and helium-4, with two protons and two neutrons, are two different isotopes of helium.

nuclide (2 facts) - A species of atomic nucleus, analogous to the word "isotope" for a species of atom. The word is also used to distinguish between atomic nuclei that are in different energy states.

proton (13 facts) (p) - A subatomic particle with positive electric charge. Every atom has at least one proton in its nucleus; the number of protons determines the element. For example, all atoms with one proton are hydrogen, all atoms with two protons are helium, and so on., One of the constituents of the atomic nucleus. It is a spin-1/2 particle carrying positive electric charge. The proton is the lightest baryon and, as a result, is the particle into which all other baryons eventually decay. It is believed to be absolutely stable, but certain theories (GUTs) predict it will decay very, very slowly., A baryon made of two up quarks and a down quark. It possesses a positive electromagnetic charge and can only be found in atomic nuclei. A single proton is a hydrogen nucleus., A massive particle with positive electrical charge found in the nuclei of atoms. Composed of two up quarks and one down quark. The proton's mass is 938.3 MeV, slightly less than that of the neutron., A positively charged elementary particle; the nucleus of a hydrogen atom. Mass of proton 1.00728 amu = 1.6726 × 10-24 g = 1836.12 me.

triton (6 facts) (T) - The nucleus of the tritium atom.

A neucleus can be found in ALL living cells.

Answer 10

doesn't it contain the protons and the neutrons or something. But the body nucleus has a bunch of other junk, yet that junk.. lol, I should know this.. thats soo sad.