A group of similar cells that perform a common function.

A microscopic, single-celled organism that lacks a nucleus and organelles (prokaryotic); have different cell walls and cell membranes than other bacteria or eukaryotes.

A eukaryotic organism, including molds, mushrooms, and yeast; can be single-celled or multi-celled.

A simple, microscopic, single-celled organism that lacks a nucleus and organelles (prokaryotic); found nearly everywhere.

A reproductive cell that is distributed through the air that can develop into an adult without fusing with another cell.

A growth of organisms on a prepared material (bacteria growing on nutrient agar).

The basic building block of all matter; made of protons, neutrons, and electrons.

An organism that consists of a single cell that does not have a nucleus; includes bacteria and archaea.

The test under normal conditions in a controlled experiment that is used to compare results with tests where a variable is changed.

An organism so small that a microscope must be used to view it.

One of the three main divisions of the current classification system of life; includes Bacteria, Archaea, and Eukaryota.

An organic molecule made out of sugars; stores (in plants) and releases (in animals) energy.

An organic molecule found in fats and oils; stores and releases energy, forms the cell membrane.

An organic molecule made out of nucleotides; provides instructions to make proteins (DNA and RNA).

An organic molecule made out of amino acids; builds and repairs body structures and regulates processes.