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N

N-acetylglucosamine (NAG)
N-regions
[of BCR and TCR genes]
N-terminal
[view]
nanos
[role of gene in Drosophila segmentation] [establishing the tail of the Drosophila embryo]
Nearsightedness
in humans
Nectar
Sugar solution, secreted by plants, from which bees make honey.
Nekton
Actively swimming animals in a body of water.
Nephron
Functional unit of vertebrate kidneys. [Discussion]
Nerve
Bundle of axons.
Nervous system
human
Net productivity
The amount of energy trapped in organic matter during a specified interval at a given trophic level less that lost by the respiration of the organisms at that level. [More]
Neural folds
[in frog embryology]
Neuraminidase
of influenza virus
Neuromuscular junction
Junction between a motor neuron and a muscle fiber. Also called a myoneural junction. [Discussion]
Neuropeptide Y
Neurotransmitter
Substance released at the axon terminals of a neuron that either stimulates or inhibits the next neuron or muscle fiber. Acetylcholine and noradrenaline are neurotransmitters. [Discussion]
Neuron
A nerve cell.
Neutron
Electrically neutral particle found in the nuclei of all atoms except hydrogen-1. [More]
Neutrophil
One of the white blood cells. [More]
Niacin
Nicotinic acid, one of the B vitamins.
Niche
The place in a biological community occupied by a particular species in its relation to other species.
Nicotinamide adenine dinucleotide (NAD) and NADP
Coenzymes that transfer electrons within the cell.[Discussion and structure] [in Calvin cycle][from light reactions[NADH dehydrogenase]
Nitric oxide (NO)
as vasodilator
Nitrogen fixation
The conversion of atmospheric nitrogen (N-N) into nitrogen-containing compounds like ammonia.
Nitrogen oxides (NOx)
[in air]
N-linkage
[Glycoproteins]
NMDA receptors
Node
(1) In plants, the point on the stem at which one or more leaves develop.[diagram] (2) Of Ranvier
noggin
[role of gene in frog embryology]
Nondisjunction
Failure of two homologous chromosomes to separate during meiosis.
Noradrenaline
Norepinephrine. [as neurotransmitter]
Notochord
Longitudinal, flexible rod located between the central nervous system and the gut at some stage in the development of all chordates. In vertebrates it is generally replaced by a column of vertebrae. [in frog embryology]
Nuclear localization sequence
[described]
Nuclear Pore Complexes
(NPCs)
Nuclear transplantation
[experiments]
Nucleic acid
A polymer of nucleotides; DNA and RNA.
Nucleolus
Nucleoside
Molecule consisting of a purine or pyrimidine attached to a 5-carbon sugar. [More]
Nucleosomes
Nucleotide
Molecule consisting of (1) a purine or pyrimidine; (2) a 5-carbon sugar; (3) one, two, or three phosphate groups covalently bonded together. [More] [Antisense oligodeoxynucleotides]
Nucleus
Nucleus accumbens
Nutrition
[requirements] [gastrointestinal (GI) tract]
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