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: the cell is a highly complex
system that is the site of intense energy exchange and which presents
vast interphase surfaces. Like all living organisms, it feeds itself,
grows, multiplies and dies.
: pat of the nucleus of a cell visible by microscope.
It consists of a dense, weblike, interconnected mass.
: central part of a cell which contains the chromosomes.
: microstructure of cytoplasm which plays a role
in oxydation and the storage of energy in a cell.
: nuclear particle that plays a role in the physiology
of a cell.
: very thin organic tissue that envelops the
nucleus of a cell.
: compound composed of amino-acids, with a large molecular
: cutaneous pigment.
: fine membrane covering a cell.
: cytoplasmic organelle that plays an important
role in the synthesis of proteins in a cell.
: substance that produces glucose in human organisms.
: gel containing the cell.
: mesh of fibres in the central part of
: granulation system of cytoplasm.
: ponticulus at the centre of a centrosome.
: intracellular organelle able to absorb solid particles
from the surrounding area.
EN : Goat
FR : Chèvre
ES : Cabra
Domestic goats are one of the oldest domesticated
species. For thousands of years, goats have been used for their milk,
meat, hair, and skins all over the world. Most goats naturally have
two horns, of various shapes and sizes depending on the breed. While
horns are a predominantly male feature, some breeds of goats have horned
females. Polled (hornless goats) are not uncommon and there have been
incidents of polycerate goats (having as many as eight horns), although
this is a genetic rarity thought to be inherited. Their horns are made
of living bone surrounded by keratin and other proteins and are used
for defense, dominance, and territoriality.
Goats are ruminants. They have a four-chambered
stomach consisting of the rumen, the reticulum, the omasum, and the
abomasum. Goats have horizontal slit-shaped pupils, an adaptation which
increases peripheral depth perception. Because goats' irises are usually
pale, the pupils are much more visible than in animals with horizontal
pupils but very dark irises, such as sheep, cattle
and most horses.
Both male and female goats have beards,
and many types of goats may have wattles, one dangling from each side
of the neck. Some breeds of sheep and goats appear superficially similar,
but goat tails are short and point up, whereas sheep tails hang down
and are usually longer, though some are short, and some long ones are