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A-B-C-D-E-F-G-H-I-J-K-L-M-N-O-P-Q-R-S-T-U-V-W-X-Y-Z
- mab-5
- C. elegans gene [see encoded homeodomain]
- Macrolide antibiotics
- Macromolecule
- A molecule with a molecular weight of several thousand or more. Proteins, nucleic acids, cellulose, and starch are macromolecules.
- Macrophage
- Phagocytic cell derived from the monocyte.
- Macrophage colony-stimulating factor
- A cytokine (M-CSF). [More]
- Magnetic resonance imaging (MRI)
- Major histocompatibility complex (MHC)
- A cluster of genes, some of whose products are involved in presenting antigens to T cells and also serve as the principal targets of graft rejection. Found in most, if not all, vertebrates. The MHC of humans is on chromosome 6 and is designated HLA. [diagram of the complex] [the class I and class II histocompatibility molecules]
- Malignant
- Refers to a cell that cannot stop dividing; also to the tumor that results. Cancerous.
- Maltose
- Mangold, Hilde
- [discovery of the organizer]
- Marijuana
- Marsupial
- Any of the order of pouched mammals such as opossums, wombats, and kangaroos. [pregnancy and birth]
- Mast cell
- Tissue equivalent of the basophil. [Role in allergies]
- Matrix
- (1) Extracellular material in which animal cells are embedded, especially those of connective tissue.(2) fluid contained within the inner membrane of mitochondria.
- Medulla
- Inner part of an organ.
- Medulla oblongata
- Megakaryocyte
- Megaspore
- Meiosis
- The two successive cell divisions, with only one duplication of the chromosomes, that produces 4 cells, each containing one-half the number of chromosomes in the original cell. [More]
- Melanocyte-stimulating hormone (MSH)
- Melatonin
- Memory cells
- of immune system
- Mendel
- his second rule
- Meninges
- Menopause
- Menstrual cycle
- Meprobamate
- Meristem
- Embryonic plant tissue that produces new cells by repeated mitosis. [Examples and discussion]
- Mesoderm
- One of the three "germ layers" in embryonic development. [More]
- Mesozoic era
- Metabolism
- Exchange of matter and energy between an organism and its environment and the transformation of this matter and energy within the organism.
[General discussion with links to specific examples] [Intermediary]
- Metabolite
- A substance used in or produced by metabolism.
- Metamorphosis
- Process of change (usually abrupt) from larval to adult form.
- Metaphase
- [mitosis][meiosis I]
- Metastasis
- A secondary growth of malignant (cancer) cells away from the site of the primary tumor.
- Methanococcus jannaschii
- [genome]
- Methionine
- [structure]
- Micron (µ)
- [defined]
- Methyl group
- [Structure] [methylation of DNA]
- Microorganism
- An organism of microscopic size such as bacteria, protozoans, and many algae. Also called a microbe.
- Micropyle
- Microspore
- Microtubules
- Discussion
- Mifepristone
- RU486
- Millirem (mrem)
- [defined]
- Mineralocorticoids
- Minerals
- [nutritional requirements] [RDAs]
- Mitochondrial stimulation factor (MSF)
- [described]
- Mitochondrion
- [structure and functions][genome][diseases]
- Mitosis
- Nuclear division that follows duplication of the chromosomes, whereby each daughter nucleus has exactly the same chromosome content as the parent nucleus. [Discussion] [
and cell cycle]
- Mixture
- Material containing two or more substances, each of which retains its characteristic properties. The composition of a mixture is variable. A solution is a mixture. [Discussion]
- Mole
- Quantity of a substance whose weight in grams is numerically equal to the molecular weight of the substance (e.g., 18 g of water is 1 mole). [More]
- Molecular weight
- Sum of the atomic weights of the atoms in a molecule.
- Molecule
- Smallest particle of a covalently bonded element or compound that retains the properties of that substance.
- Molt
- To shed the outer covering.
- Monoamine oxidase (MAO) inhibitors
- Monoclonal antibodies
- Monocyte
- Blood-borne cell that becomes a macrophage in the tissues.
- Monoecious
- Having both female and male cones or flowers on the same plant. [More]
- Monoglyceride
- Glycerol carrying a single fatty acid.
- Monomer
- Simple molecular unit that can be linked with others to form a polymer. The glucose molecule is the monomer of starch.
- Monosaccharide
- A simple sugar, for example, glucose. [More]
- Monotremes
- View
- Morphology
- Study of structure.
- Moss
- life cycle
- Motor unit
- All the skeletal muscle fibers stimulated by a single motor neuron. [Discussion]
- M-phase promoting factor (MPF)
- [in cell cycle]
- Multiple alleles
- More than two alleles found at a give gene locus in a population.
- Multiple factors
- Nonallelic genes that affect the same trait in an additive fashion.
- Multiple sclerosis
- as autoimmune disease
- Muscles
- Discussion of skeletal, cardiac, and smooth muscle.
- Muscular dystrophy
- Mutagen
- Agent that causes mutations. [Ionizing Radiation] [Testing chemical mutagens in bacteria] [Testing chemical mutagens in mice]
- Mutation
- Stable change in a gene. [More] [Germline vs somatic] [in B-cell antibody genes]
- Mutualism
- Close, mutually beneficial, association between two organisms of different species.
- MX (3-chloro-4-(dichloromethyl)-5-hydroxy-2(5H)-furanone) [mutagenic by-product of water chlorination]
- Myasthenia gravis
- Autoimmune disorder of the neuromuscular junction. [More]
- Mycelium
- Mass of interwoven hyphae of a fungus.
- Mycophenolate mofetil (CellCept)
- Mycoplasma
- [genitalium] [pneumoniae]
- Mycorrhiza
- The symbiotic association of a fungus with the roots of a plant.
- Myelin sheath
- Fatty covering around many axons. It is made up of layers of the plasma membrane of Schwann cells. [More]
- Myeloma protein
- The immunoglobulin (antibody) produced by a cancerous clone of plasma cells.
- Myoneural junction
- Junction between a motor neuron and a muscle fiber. Also called a neuromuscular junction. [Discussion]
- Myofibrils
- In skeletal and cardiac muscle.
- Myosin
- In muscle.