
A B C D E F G H I K L M N O P R S T V W X Y
Macrophage
A type of white blood cell produced in blood vessels and loose connective tissues that can ingest dead tissues and cells and is involved in producing interleukin-1. When exposed to the lymphokine macrophage-activating factor, macrophages also kill tumor cells. See also Phagocyte.
Macrophage colony stimulating factor (M-CSF)
A natural hormone that stimulates the production of white blood cells, particularly monocytes (the precursors of macrophages).
Medium
A substance containing nutrients needed for cell growth.
Meiosis
Process of cell reproduction whereby the daughter cells have half the chromosome number of the parent cells. Sex cells are formed by meiosis. Compare Mitosis.
Messenger RNA (mRNA)
Nucleic acid that carries instructions to a ribosome for the synthesis of a particular protein.
Metabolism
All biochemical activities carried out by an organism to maintain life.
Microbial herbicides and pesticides
Microorganisms that are toxic to specific plants or insects. Because of their narrow host range and limited toxicity, these microorganisms may be preferable to their chemical counterparts for certain pest-control applications.
Microbiology
Study of living organisms that can be seen only under a microscope.
Microinjection
The injection of DNA using a very fine needle into a cell.
Microorganism
Any organism that can be seen only with the aid of a microscope. Also called microbe.
Mitosis
Process of cell reproduction whereby the daughter cells are identical in chromosome number to the parent cells. Compare Meiosis.
Molecular genetics
Study of how genes function to control cellular activities.
Monoclonal antibody (MAb)
Highly specific, purified antibody that is derived from only one clone of cells and recognizes only one antigen. See also Hybridoma; Myeloma.
Monocytes
One of three types of white blood cells. Monocytes are precursors to macrophages.
Multigenic
Of hereditary characteristics, one that is specified by several genes.
Mutagen
A substance that induces mutations.
Mutant
A cell that manifests new characteristics due to a change in its DNA.
Mutation
A change in the genetic material of a cell.
Myeloma
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