célula fotorreceptora

célula fotorreceptora

A cell, functionally part of the nervous system, that reacts to the presence of light. It usually contains a pigment that undergoes a chemical change when light is absorbed. This chemical change stimulates electrical changes in the photoreceptor that, when passed along and processed by other neurons, form the basis of vision.

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Branche/domæne: Archaeology
Category: Evolution
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Relaterede termer

célula

Electrical equipment; Power supplies

Unidad capaz de servir como fuente de tensión de corriente directa (CD) a través de la transferencia de iones en el transcurso de una reacción química.

célula

Archaeology; Evolution

The basic structural and functional unit of most living organisms. Cell size varies, but most cells are microscopic. Cells may exist as independent units of life, as in bacteria ...

célula

Anthropology; Physical anthropology

A complex unit of protoplasm, usually with a nucleus, cytoplasm, and an enclosing membrane. All plants and animals are composed of one or more microscopic cells. The smallest ...

célula

Biology; Genetics

Fundamental structural unit of all life. The cell consists primarily of an outer plasma membrane, which separates it from the environment; the genetic material (DNA), which ...

célula

Biology; Genome

The basic unit of any living organism that carries on the biochemical processes of life. See also: genome, nucleus.

hongos

Archaeology; Evolution

A group of organisms comprising the kingdom Fungi, which includes molds and mushrooms. They can exist either as single cells or make up a multicellular body called a mycelium. ...

ley

Archaeology; Evolution

A description of how a natural phenomenon will occur under certain circumstances.

pirimidina

Archaeology; Evolution

A kind of base. In DNA, cytosine (C) and thymine (T) are pyrimidines. In RNA, cytosine (C) and uracil (U) are pyrimidines.

ecosistema

Archaeology; Evolution

A community of organisms interacting with a particular environment.

mitocondria

Archaeology; Evolution

A kind of organelle in eukaryotic cells. Mitochondria produce enzymes to convert food to energy. They contain DNA coding for some mitochondrial proteins.

protozoarios

Archaeology; Evolution

A group of unicellular, usually microscopic, organisms now classified in various phyla of the kingdom Protoctista. They were formerly regarded either as a phylum of simple animals ...

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Branche/domæne: Astronomy Category: Galaxy

burbujas de la Vía Láctea

Las dos grandes burbujas con rayos gama de alta energía que sobresalen de la Vía Láctea. Cada una abarca 25000 años luz, casi el tamaño de la galaxia ...