The correct answer to the question is option 4, nucleic acid. Nucleic acids are one of the four main types of macromolecules found in cells, along with carbohydrates, proteins, and lipids. Nucleic acids are responsible for storing and transmitting genetic information in the cell. They are made up of nucleotide monomers, which consist of a sugar molecule (either deoxyribose or ribose), a phosphate group, and a nitrogenous base (either adenine, thymine, cytosine, guanine, or uracil). There are two types of nucleic acids: deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). DNA is found in the nucleus of eukaryotic cells and carries the instructions for making proteins. RNA is synthesized from DNA and plays a crucial role in protein synthesis. Nucleic acids are considered "immovable" because they are primarily found in the nucleus of the cell, where they remain relatively static and do not move around freely like other molecules.