Biology Key Terms Unit 1

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Biology

Back

The scientific study of life and living organisms.

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Atom

Back

The smallest and most fundamental unit of matter.

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Molecule

Back

A chemical structure consisting of at least two atoms held together by a chemical bond.

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Macromolecule

Back

A large molecule, often formed by polymerization of smaller monomers.

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Organelle

Back

A membrane-bound compartment or sac within a cell.

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Cell

Back

The smallest fundamental unit of structure and function in living organisms.

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Tissue

Back

A group of similar cells carrying out related functions.

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Organ

Back

A structure formed of tissues operating together to perform a common function.

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Organ System

Back

A higher level of organization that consists of functionally related organs.

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Organism

Back

An individual living entity.