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A gelatinous or mucinous substance that is present in tissues during disease or naturally (as in the thyroid), a substance made up of particles that are too small to be resolved under a standard light microscope but too large to pass through a semipermeable membrane.

Any substance that contains particles that are significantly larger than atoms or regular molecules yet too small to be seen with the naked eye is referred to as a colloid.

A homogenous mixture of two or more substances in relative amounts that can be varied continuously up to what is called the limit of solubility.

The water-like substance contained in bacterial cells is called cytosol. The cytosol contains all the other internal compounds and components the bacteria need for survival. The cytoplasm of the cell is the fluid and all of its dissolved or suspended particles.

Cytoplasm composed of about 70% water and 30% is filled with enzymes (proteins the cell makes itself to use for energy).

Proteins in water is an example of colloid sol. So, the fluid in bacterial cell can be considered as colloid.

Some other nutrients, ions and gases dissolved in water of fluid and make solution. Hence fluid of bacterial cell can also be a solution.