enlace covalente

A covalent bond in which atoms share electrons in an unequal fashion. The resulting molecule has regions with positive and negative charges. The presence of polar covalent bonds ...

núcleo del átomo

Biologia; Biologia Komórki

An atom's core; contains protons and one or more neutrons (except hydrogen, which has no neutrons).

número atómico

Biologia; Biologia Komórki

The number of protons in the nucleus of an atom.

asma

Biologia; Biologia Komórki

A respiratory disorder caused by allergies that constrict the bronchioles by inducing spasms in the muscles surrounding the lungs, by causing the bronchioles to swell, or by ...

ascomicetos

Biologia; Biologia Komórki

Division of fungi that contains the yeasts and morels; ascomycetes produce an ascus (or sac) in which ascospores are produced.

selección artificial

Biologia; Biologia Komórki

The process in which breeders choose the variants to be used to produce succeeding generations.

reproducción asexual

Biologia; Biologia Komórki

A method of reproduction in which genetically identical offspring are produced from a single parent; occurs by many mechanisms, including fission, budding, and fragmentation.