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What is a nucleus?
Question Date: 2013-04-25
Answer 1:

The nucleus is like the boss of a cell. All living things are made of cells. Some things are only one cell big. You and I are made out of so many cells that you couldn’t count them. Cells are so small that you need a microscope to see them. The nucleus is usually the big round thing you see inside a cell.

The nucleus of the cell is where the DNA is. DNA has all the recipes that it takes to make a living thing. The recipe for making you is in your skin cells, your muscle cells, your liver cells. There are only a couple of types of cells in your body that don’t have all of the directions for making you. It is sort of like the brain of the cell.

If you took one of your cells, and grew a new person from them, would that person be just like you? They would have the same DNA, but would they be different because different things would happen to them when they were growing up?

If you like to learn about cells, you may want to study cell biology.


Answer 2:

Thanks for asking! A nucleus of an atom is the place where the protons and neutrons are found. A proton is a very small particle that has positive electrical charge, and a neutron is an equally small particle that has no charge. Outside of the nucleus are electrons that orbit, meaning they spin very close to the nucleus. The electron is even smaller than the proton or neutron and has a negative electrical charge. Because the electron is negative and the proton is positive, they are attracted to each other, and so electrons like to orbit around the nucleus. Electrons never fall into the nucleus because they are moving too fast around it. Both protons and neutrons make up the weight of an atom (the electron is so tiny that it is almost weightless). For example, a hydrogen atom has just one proton and one electron (but no neutron), and is the lightest atom we know. A helium atom is slightly heavier with two protons, two neutrons, and two electrons. Hydrogen and helium are both very common light gases that we use every day. If we had a big enough microscope, we could actually see the nucleus with all its protons and neutrons!


Answer 3:

The answer to your question depends on what kind of science we are talking about! In physics or chemistry, a nucleus refers to the object at the core of an atom. A nucleus of an atom usually contains protons, which are particles with a positive charge, and neutrons, which are particles that are neutrally charged (no charge).

On the other hand, in biology, the nucleus of a cell is many times larger than the nucleus of an atom. The nucleus of a cell typically holds DNA, proteins, RNA, and other important chemicals!


Answer 4:

In biology, a nucleus is kind of like the "control center" of a cell because it gives instructions to the cell and contains the cell's genetic information such as DNA.It helps control eating, movement, and reproduction of the cell and only found in eukaryotic cells. The nucleus is surrounded by a membrane called the nuclear membrane and it protects the nucleus from dangers outside, but it is also porous as to allow certain things to come in and to go out. It is also an area in which protons and neutrons are composed.


Answer 5:

A nucleus is a mass in the middle of the cell that is surrounded by a membrane. The membrane allows for the nucleus to be separated from the cytoplasm and the rest of the cell. Just like how we have a brain to control our movements, emotions, and our body, cells have a nucleus to control its functions, like cell growth and reproduction. It also contains the genetic material for the cells, like chromosomes, which have DNA.


Answer 6:

The term 'nucleus' is used to mean many different things in many different contexts, so I cannot answer your question based on this alone. In physics, a nucleus refers to the nucleus of an atom, which is composed of protons and neutrons.

In biology, the nucleus of a cell contains the cell's DNA.

In meteorology (weather science), a nucleus is a particle of dirt or salt or something that water condenses onto, creating a cloud droplet or ice crystal.

In astronomy, a nucleus is the interior bulge in the middle of a spiral or disk-shaped galaxy and contains older stars and less plasma and dust than the spiral arms.


Answer 7:

A nucleus is the center of an atom, where the subatomic particles are. All atoms are made of three subatomic ("smaller than an atom") particles: neutrons, protons, and electrons. The neutrons and protons are in the nucleus, and they give an atom most of its mass, and positive charge. The electrons are negatively charged, and surround the nucleus to balance the charge, but there is a huge empty space between the nucleus and the electrons. The nucleus is so small compared to the volume that electrons take up over 99% of atoms are empty space, but somehow everything feels pretty solid! (electrons move around inside a large volume that we call the atom, but each electron is very small if you treat it like a particle. You'll learn later you can treat it like a wave, but don't worry about that yet.)



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