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M

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.
Macronucleus
Macrophage
Macrophage colony-stimulating factor (M-CSF)
MAD ("mitotic arrest defective")
Mad cow disease
Magnetic resonance imaging (MRI)
Magnetoencephalography (MEG)
Magnetoreceptors
Magnetotaxis
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]
Malaria
[Life cycle of Plasmodium vivax] [evading host immunity]
Malignant
Refers to a cell that cannot stop dividing; also to the tumor that results. Cancerous.
Maltose
Mammals
orders of placental mammals
Mandibulata
Mangold, Hilde
Marijuana
Marine ecosystems
Mars (life on?)
Marsupial
Any of the order of pouched mammals such as opossums, wombats, and kangaroos. [Discussion] [pregnancy and birth]
Mast cell
[role in allergies]
Matrix
(1) Extracellular material in which animal cells are embedded, especially those of connective tissue [More]. (2) Fluid contained within the inner membrane of mitochondria.
Maximum sustainable yield
Mayr, E.
McClintock, Barbara
[and transposons] [demonstration that genetic recombination of linked genes occurs by chromosome crossovers]
MCM proteins ("minichromosome maintenance proteins")
Mechanoreceptors
Medulla
Inner part of an organ.
Medulla oblongata
Megakaryocyte
Megaspore
Meiosis
Melanocyte-stimulating hormone (MSH)
Melanopsin
Melatonin
Membrane Attack Complex
Memory
[Implicit and Explicit] [and long-term potentiation (LTP)]
Memory cells of immune system
Mendel, G.
[his monohybrid crosses] [his second rule]
Meninges
Menopause
Menstrual cycle
Meprobamate
Meristem
[in roots] [in stems]
Meselson, M. S.
Mesoderm
Mesophyll
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.
Metabolome
Metagenomics
Metamorphosis, insect
Metaphase
[in mitosis] [in meiosis I]
Metastasis
A secondary growth of malignant (cancer) cells away from the site of the primary tumor.
Metazoa (the animals)
Methane
a greenhouse gas
Methanogens
Methionine
Methyl group
[structure] [methylation of DNA] [methylation of histones]
Michaelis-Menten constant
Micron (µ)
Micronucleus
Microorganism
An organism of microscopic size such as bacteria, protozoans, and many algae. Also called a microbe.
Micropyle
MicroRNAs (miRNAs)
Microspore
Microsporidia
Microtubules
Microvilli
Mifepristone (RU486)
Miller, Stanley
Millisievert (mSv)
Mimicry
Mineralocorticoids
Minerals
[nutritional requirements] [Recommended Dietary Allowances (RDAs)]
Miniature Inverted-repeat Transposable Elements (MITEs)
Miracidium
Mismatch repair of DNA
Mitochondrial Eve
Mitochondrial stimulation factor (MSF)
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]
Mixtures
Mole
Molecular clocks
Molecular weight
Molecule
Smallest particle of a covalently bonded element or compound that retains the properties of that substance.
Mollusks
Molt
To shed the outer covering. [in insects] [disruptors as insecticides]
Monoamine oxidase (MAO) inhibitors
Monoclonal antibodies
[for treatment of cancer]
Monocots
[stem structure]
Monocyte
Monoecious
Having both female and male cones or flowers on the same plant. [More]
Monoglyceride
Glycerol carrying a single fatty acid.
Monohybrid cross
Monomer
Simple molecular unit that can be linked with others to form a polymer. The glucose molecule is the monomer of starch.
Monoplacophora
Monosaccharide
Monotremes
Egg-laying mammals (Prototheria) [Discussion]
Morgan, T. H.
Morphology
Study of structure.
Mosaics, genetic
Moss
[life cycle] [evolutionary relationships]
Motor unit
M-phase promoting factor (MPF)
MPS-I (mucopolysaccharidosis I)
Multiple alleles
More than two alleles found at a give gene locus in a population. [example in plants] [example in humans]
Multiple factors
Nonallelic genes that affect the same trait in an additive fashion. [More]
Multiple myeloma
Multiple sclerosis
[as autoimmune disease]
Murchison meteorite
Muscarinic acetylcholine receptors
Muscles
[Discussion of skeletal, cardiac, and smooth muscle] [testing the sliding-filament model of muscle contraction]
Muscle spindles
Muscular dystrophy
Mutagen
Agent that causes mutations. [Ionizing radiation] [Testing chemical mutagens in bacteria] [Testing chemical mutagens in mice]
Mutation
[general discussion] [and evolution] [germline vs somatic] [in B-cell antibody genes] [by transposons] [temperature-sensitive]
Mutualism
Myasthenia gravis
myc
[and Burkitt's lymphoma]
Mycelium
Mycobacteria
[uptake by cells] [Mycobacterium leprae genome]
Mycoplasma
[genomes of]
Mycorrhiza
Myelin sheath
Myeloid
Refers to all the blood cells except the lymphocytes.
Myeloma protein
The immunoglobulin (antibody) produced by a cancerous clone of plasma cells. [View]
Myeloperoxidase
Myofibrils
Myoneural junction (also called a neuromuscular junction)
Myosin
Myostatin
Myriapoda
Myxobacteria
Myxoma virus
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