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▷ ARN ◁ 【 Tipos de ARN 】 | Carpetapedagogica.com

ARN

ARN

ARN: Ácido ribonucleico (RNA), es un ácido nucleico, constituido por una cadena de ribonucleótidos formada por una pentosa, ribosas y bases nitrogenadas: Adenina, guanina, citosina y uracilo. El ARN, se encuentra presente en células procariotas y en eucariotas y tiene como función principal: Guardar, transportar y transmitir la información entregada por el ADN.

Clases de ARN:
✍ En bacterias hay 3 clases de ARN: ARN mensajero, ARN de transferencia y ARN ribosomal.
✍ En células eucariotas hay 4 clases de ARN: ARN heterogéneo nuclear, ARN mensajero, ARN de transferencia y ARN ribosomal.

» Ver: Biología | Temario de Biología

1. ARN en células eucariotas

Tipos de ARN:

ARN EN CÉLULAS EUCARIOTAS
TIPOS
CARACTERÍSTICAS
ARN hn
ARN hn: Ácido ribonucleico Heterogéneo Nuclear.
Se elabora a partir de una cadena molde de ADN en el interior del núcleo.
Tiene forma lineal.
Es el precursor del ARNm, ARNt, ARNr.
ARNm
ARNm: Ácido ribonucleico Mensajero.
Tiene forma lineal.
Molécula que sale del núcleo hacia los ribosomas con la información para que estos sinteticen proteínas.
Está constituido por codones (agrupación de tres bases nitrogenadas).
ARNt
ARNt: Ácido ribonucleico de Transferencia.
Su función es transportar y adaptar aminoácidos durante la síntesis de proteínas.
Tiene forma de hoja de trébol.
Está constituido por el anticodon (localizado en el asa 2).
Agrupación de tres bases nitrogenadas.
ARNr
ARNr: Ácido ribonucleico Ribosomal.
Más abundante forma globular.
Se localiza en los ribosomas (65%).
En la subunidad menor hay una molécula de ARNr.
En la subunidad mayor hay dos moléculas de ARNr.
❋ Tabla N° 1: ARN en Células Eucariotas / Elaborada por Carpetapedagogica.com

2. Células

Artículo: Célula.

Célula
Célula

Célula: Es la unidad morfológica, fisiológica, genética, trófica, patológica y evolutiva de los seres vivos. Tipos de células: Célula procariota y célula eucariota. Todas las células eucariotas presentan cuatro partes principales y estas son: La envoltura celular, la membrana citoplasmática, el citoplasma, el núcleo.

» Célula

❋ Cita: Carpetapedagogica.com (2020). "ARN"

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