Addiction and neural ageing
Addiction and neural ageing

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Glossary for SD805_2
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norm of reaction

The range of phenotypes that may arise from the interplay between a given genotype and various environments.

nuclear envelope

The double layer of membranes that surrounds the nucleus.

nuclear pores

Perforations in the nuclear envelope which allow communication between the cytoplasm and the nucleus.


The repeating unit in nucleic acids (DNA and RNA); composed of a base, a sugar and a phosphate group.


A word that has two different meanings in biology, as follows.

  1. The organisational centre of a cell, which contains its genetic material.
  2. A collection of neuron cell bodies in the central nervous system.

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