Glossary of terms used on this site

Glossary of biology.

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Glossaries

Term Main definition
nondisjunction
Glossaries - Biology glossary

failure of synapsed homologs to completely separate and migrate to separate poles during the meiosis' first cell division

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

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