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Magma
Molten rock found beneath the surface of the Earth.
Mantle
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The part of the Earth that lay between the lithosphere and the outer core. This region is approximately 2300km thick. Image can be found at Classroom@Sea: The Carlsberg Ridge Cruise. |
Mars
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The fourth planet in our solar system from the Sun. Roughly about half the size of Earth, and covered in rusty-colored dust, people often refer to it as the "Red Planet." Some facts and figures:
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Medulla oblongata
(Anatomy) The Part of the brain that regulates respiration and circulation.
Megaparsec
One million parsecs.
Melanin
A pigment found in vertebrate animals which is useful in providing protection from ultraviolet rays from the sun.
Merogony
Merogony can be defined several ways:
- Incomplete development of an ovum.
- Schizogony resulting in the production of merozoites.
Meront
An asexual stage in the development of certain protozoa that leads to the formation of merozoites.
Merozoite
A stage in the life cycle of certain sporozoan protozoa resulting from merogony. Also known as schizozoite.
MessengerRNA
Also known as mRNA. A single strand of ribonucleotides transcribed from DNA, and then translated into a polypeptide chain.
Metamorphic Rock
A certain type of rock that forms when preexisting material is subject to intense pressure and/or heat, but before it can be completely remelted.
Microspore
A haploid spore type found in heterosporous plants that will form to make the male gametophyte.
Microtubule
Thin tubular structures made up of protein which are found in the organelles providing locomotion to various organisms, known generally as undulipodia.
Midgut
The middle portion of the vertebrate digestive tract, where the ileum, jejunum, parts of the duodenum, and parts of the colon form. In invertebrates, the portion of the digestive tract where the majority of digestion occurs.
Mitochondria
An organelle found in eukaryotic organisms that causes oxidation in energy-rich molecules. This process creates energy for a cell.
Mitosis
Form of cell division where the nucleus splits and creates two daughter nuclei, each with an equal amount of chromosomes.
Monocot
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Also monocotyledon. A flowering plant that has a single cotyledon. Image can be found at Lab Help for Ex. 5 Green Plant - I. |
Monosaccharide
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The simplest sugar unit, which keeps a ratio of two hydrogen atoms for every oxygen and carbon atom |
Motor
A term that refers to anything that is involved with physiological response, which is often movement. Examples include: motor cells, motor neurons, and motor units.
Multinucleate
Having more than one nucleus.
Mutualism
A type of symbiotic relationship where both species are dependant on each other, and both benefit. An example of mutualism can be found with the Bull-horn acacia (Acacia cornigera) and the stinging ants (Pseudomyrmex ferruginea). The ant provides protection from organisms that feed on the acacia, while the acacia provides a place for the ants to live.
Mycelium
The indefinite body of a multicellular fungus composed of filamentous structures called hyphae.
Myosin
A protein that works in tandem with actin in controlling muscle contraction.
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