General

General

General nature or nature terms.

Industry: Natural environment

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General

mantle

Biology; General

In mollusks, a membranous or muscular structure that surrounds the visceral mass and secretes a shell if one is present.

metastasis

Biology; General

The process in which cancer cells break away from the original tumor mass and establish new tumor sites elsewhere in the body.

macromolecules

Biology; General

Large molecules made up of many small organic molecules that are often referred to as monomers; e.g., carbohydrates, lipids, proteins, and nucleic acids. Macromolecules are polymers of monomers.

macronucleus

Biology; General

In ciliates, the large nucleus that carries up to several hundred copies of the genome and controls metabolism and asexual reproduction.

marine biome

Biology; General

The aquatic biome consisting of waters containing 3.5% salt on average; includes the oceans and covers more than 70% of the Earth's surface; divided into benthic and pelagic zones.

methanogens

Biology; General

A group of archaebacteria that produce methane as a by product of their metabolism.

macronutrients

Biology; General

1. Elements needed by plants in relatively large (primary) or smaller (secondary) quantities. 2. Foods needed by animals daily or on a fairly regular basis.