Trick to remember average composition of cell:

The average composition of a cell includes several biomolecules such as proteins, nucleic acids, lipids, and carbohydrates. Here are some tricks to remember their approximate percentages:

Proteins:
- Proteins make up around 15% of the cell's composition.
- To remember this, you can think of "15" as the atomic number of phosphorus (P), which is an essential element for life.

Nucleic acids:
- Nucleic acids make up around 5% of the cell's composition.
- To remember this, you can think of "5" as the number of nitrogen (N) atoms in a single nucleotide.

Lipids:
- Lipids make up around 25% of the cell's composition.
- To remember this, you can think of "25" as the melting point of most animal fats, which are composed of lipids.

Carbohydrates:
- Carbohydrates make up around 5% of the cell's composition.
- To remember this, you can think of "5" as the number of carbon (C) atoms in a single glucose molecule, which is a common carbohydrate.

Water:
- Water makes up around 50-60% of the cell's composition.
- To remember this, you can think of the fact that water is essential for life and makes up the majority of our bodies.

By using these tricks, you can easily remember the approximate percentages of the major biomolecules in a cell.