In biology, the smallest unit that can perform all life processes; cells are covered by a membrane and contain DNA and cytoplasm.
Cell
In a eukaryotic cell, a membrane-bound organelle that contains the cell’s DNA and that has a role in processes such as growth, metabolism, and reproduction.
Nucleus
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Cytoplasm
In eukaryotic cells, the cell organelle that is surrounded by the two membranes and that is the site of cellular respiration.
Mitochondria / Mitochondrion
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Cell Wall
A cell organelle composed of RNA and protein; the the site of protein synthesis.
Ribosome
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Chloroplast
An organism that consists of a single cell that does not have a nucleus.
Prokaryote
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Endoplasmic Reticulum
A collection of tissues that carry out a specialized function of the body.
Organ
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Lysosome
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Vacuole
The arrangement of the parts in an organism.
Structure
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Eukaryote
