Glossary of terms used on this site
Glossary of biology.
Glossaries
Term | Main definition |
---|---|
nondisjunction |
Glossaries - Biology glossary
|
nonparental (recombinant) type |
Glossaries - Biology glossary
progeny resulting from homologous recombination that exhibits a different allele combination compared with its parents |
nonpolar covalent bond |
Glossaries - Biology glossary
type of covalent bond that forms between atoms when electrons are shared equally between them |
nonrandom mating |
Glossaries - Biology glossary
changes in a population’s gene pool due to mate choice or other forces that cause individuals to mate with certain phenotypes more than others |
nonrenewable resource |
Glossaries - Biology glossary
resource, such as fossil fuel, that is either regenerated very slowly or not at all |
nonsense codon |
Glossaries - Biology glossary
one of the three mRNA codons that specifies termination of translation |
nontemplate strand |
Glossaries - Biology glossary
strand of DNA that is not used to transcribe mRNA; this strand is identical to the mRNA except that T nucleotides in the DNA are replaced by U nucleotides in the mRNA |
norepinephrine |
Glossaries - Biology glossary
neurotransmitter and hormone released by activation of the sympathetic nervous system |
norepinephrine |
Glossaries - Biology glossary
hormone released by the adrenal medulla in response to a short-term stress hormone production by the gonads |
Northern blotting |
Glossaries - Biology glossary
transfer of RNA from a gel to a nylon membrane |
notochord |
Glossaries - Biology glossary
flexible, rod-shaped support structure that is found in the embryonic stage of all chordates and in the adult stage of some chordates |
nuclear envelope |
Glossaries - Biology glossary
double-membrane structure that constitutes the nucleus' outermost portion |
nucleic acid |
Glossaries - Biology glossary
biological macromolecule that carries the genetic blueprint of a cell and carries instructions for the functioning of the cell. |
nucleoid |
Glossaries - Biology glossary
central part of a prokaryotic cell's central part where the chromosome is located |
nucleolus |
Glossaries - Biology glossary
darkly staining body within the nucleus that is responsible for assembling ribosome subunits |