Multicellular
Consisting of many cells
Multigene family
A collection of genes with similar or identical sequences, presumably of common origin.
Musculature
The system or arrangement of muscles in a body or a body part.
Mutagen
A chemical or physical agent that interacts with DNA and causes a mutation.
Mutagenesis
The creation of mutations.
Mutant
An organism carrying a gene that has undergone a mutation.
Mutation
A rare change in the DNA of genes that ultimately creates genetic diversity.
Mutualism
A symbiotic relationship in which both the host and the symbiont benefit.
Mycelium
The densely branched network of hyphae in a fungus.
Mucilage
A gummy substance obtained from certain plants.
Mycorrhizae
Mutualistic associations of plant roots and fungi.
Myelin sheath
In a neuron, an insulating coat of cell membrane from Schwann cells that is interrupted by
nodes of Ranvier where saltatory conduction occurs.
Myofibril
A fibril collectively arranged in longitudinal bundles in muscle cells (fibers); composed of
thin filaments of actin and a regulatory protein and thick filaments of myosin.
Myoglobin
An oxygen-storing, pigmented protein in muscle cells.
Myosin
A type of protein filament that interacts with actin filaments to cause cell contraction.
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