1. Carbohydrates: These are sugars and starches that provide energy for the cell. They also play structural roles, such as forming part of cell walls in plants. Examples include glucose, fructose, and cellulose.

2. Lipids (Fats and Oils): These are hydrophobic molecules that store energy, form cell membranes, and provide insulation. Examples include triglycerides, phospholipids, and cholesterol.

3. Proteins: These are complex molecules made up of amino acids. They perform a vast array of functions in the cell, including:

* Enzymes: Catalyze (speed up) chemical reactions.

* Structural components: Provide support and shape.

* Hormones: Act as chemical messengers.

* Antibodies: Help the immune system fight off infections.

4. Nucleic Acids: These molecules store and transmit genetic information. They are made up of nucleotides, which contain a sugar, a phosphate group, and a nitrogenous base. The two main types are:

* DNA (deoxyribonucleic acid): Contains the genetic blueprint for the cell.

* RNA (ribonucleic acid): Plays a role in protein synthesis.

These are just four of the many types of molecules found in cells. Other important molecules include water, vitamins, minerals, and many others.