Protons and neutrons are found together in the part of the atom called the

Nucleus

Explanation:

In the structure of an atom, protons and neutrons stay within the nucleus of atom while the electron revolves around the nucleus.  

A proton is positively charged while a neutron being neutral  has no charge on it. Therefore a nucleus is  positively charged

Electron being outside the nucleus are involved in formation of chemical bond.  

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.