Cell Theory and Cell Diversity

These flashcards cover key vocabulary and concepts related to Cell Theory and Cell Diversity.

Cell

The basic structural, functional, and biological unit of all organisms; the smallest unit of life.

Unicellular

An organism composed of a single cell, such as all bacteria, some protists, and some fungi.

Multicellular

Organisms made of many cells, including all plants, animals, and some protists and fungi.

Prokaryote

Primitive cell type that lacks a nucleus and membrane-bound organelles; includes bacteria.

Eukaryote

An advanced cell type that contains a nucleus and membrane-bound organelles; can be unicellular or multicellular.

Nucleus

The membrane-bound organelle in eukaryotic cells that contains the cell's DNA.

Nucleoid

The region in a prokaryotic cell where the DNA is located; not surrounded by a membrane.

Endosymbiotic theory

The theory that explains the origin of eukaryotic cells from larger prokaryotes engulfing smaller prokaryotes, which then lived in a symbiotic relationship.

Cell Theory

A fundamental theory in biology stating that all living things are made of cells, that cells are the basic unit of structure and function in living organisms, and that all cells arise from preexisting cells.

Common Cell Features

Five features common to all cells: DNA, ribosomes, membrane-enclosed organelles, cell membrane, and cytoplasm.