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Nitrogenous base
A nitrogenous molecule that has the same chemical properties as a base.
Node
In plants, a joint in the stem where one or more leaves can grow.
Nucleoid
A region in the bacterial cell where the chromosomes are kept, but not in a membrane, and generally not very distinct from other parts of the bacterium.
Nucleoside
A molecule composed of either a purine or a pyrimidine that is bound to a sugar with five carbon atoms.
In biology, its the organelle that houses the DNA and keeps it distinct from the rest of the eukaryotic cell. In chemistry, it is the center of an atom, which contains at least one proton, and in elements other than hydrogen, at least one neutron.
Nutrient
Any substance taken from its environment and used for a metabolic reaction.
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