Question

How are atoms and molecules related to cells?

Answer 1

However, at the most basic level, your body and, in fact, all of life, as well as the nonliving world is made up of atoms, often organized into larger structures called molecules.
Atoms molecules follow the rules of chemistry and physics, even when they're part of a complex, living, being. If you remember in chemistry that adequate atoms tend to lose or gain electrons, those are facts which remain true eventually when the atoms or molecules are part of a living thing too.

Complete answer:
We all know that the atom is the smallest component of an element which retains all of the chemical properties of the element. For example we can consider that one hydrogen atom has all of the properties of elements of hydrogen, that is it exists as gas at room temperature, meanwhile it bonds with oxygen to create water. Hydrogen atoms can't be broken down into smaller molecules while still retaining properties of hydrogen. If a hydrogen atom is broken down into subatomic particles it would no longer exist with having the properties of hydrogen.
At the most basic level all organisms tend to be made of a number of combinations of elements. They contain atoms that would combine together to form molecules. In multicellular organisms that are animals, here molecules can have interaction to form cells that combine to form tissue at extreme ordinates, which ends up to development of organs. These combinations continue until the entire multi cellular organism is formed.
All atoms contain protons, electrons, and neutrons. The only exception is hydrogen, which is made of one proton and one electron. A proton is positive charge particles that are residing in the nucleus of an atom and have mass of one and charge of a positive one. An electron is a negative charge particle which travels in the free space around the nucleus. In other words we can say that it resides outside of the nucleus. It has a negligible amount mass and has a charge that is negative.
In short cells are made of molecules and molecules are made of atoms. Molecules are made of atoms. Cells are made by multitude of molecules. The best DNA for an example, is a long molecule which is mainly made of carbon atoms. So cells are made of molecules and sub consequently of atoms.

Note: Remember Protons, neutrons, and electrons are very small, and most of the volume of an atom greater than 99 percent is actually empty space. With all of this empty free space, we might also have doubt why so called solid objects don’t just pass through one another. The solution is that the negative charge electron is clouds of the atom which will repel each other if they get too close to each other which in result leads to our perception of solidity.