Biotechnology and Genetics terms starting with N

118 terms

  1. Nucleoside A building block of DNA and RNA, consisting of a nitrogenous base linked to a five carbon sugar. (See Nucleoside analog.)
  2. Nucleoside analog A synthetic molecule that resembles a naturally occuring nucleoside, but that lacks a bond site needed to link it to an adjacent nucleotide.
  3. nucleoside analogue A synthetic molecule that resembles a naturally occurring nucleoside.
  4. nucleosome Spherical sub-units of eukaryotic chromatin that are composed of a core particle consisting of an octamer of histones (two molecules each of histones H2a…
  5. Nucleotide (NOO-klee-oh-TIDE) A building block for nucleic acids (the molecules inside cells that carry genetic information).
  6. nucleotide sequence See: sequence.
  7. Nucleus (NOO-klee-us) In biology, the structure in a cell that contains the chromosomes.
  8. null allele An allele which produces no functional gene product.
  9. null mutation See: amorph.
  10. nullisomic (Adj.) See: nullisomy.
  11. nullisomy An otherwise diploid cell or organism lacking both members of a homologous chromosome pair.
  12. nurse culture Culturing cells from a suspension culture on a raft of filter paper above a callus tissue piece (nurse tissue).
  13. nutriceutical A conventional food product that has been modified (potentially by genetic engineering) to have improved nutritional characteristics and/or pharmaceutical…
  14. nutrient cycle The passage of a nutrient or element through an ecosystem, including its assimilation and release by various organisms and its transformation into various…
  15. nutrient deficiency Absence or insufficiency of an essential factor for normal growth and development.
  16. nutrient film technique (Abbreviation: NFT). A hydroponic technique used to grow plants. NFT delivers a thin film of water or nutrient solution either continuously or through…
  17. nutrient gradient A diffusion gradient of nutrients and gases that develops in tissues where only a portion of the tissue is in contact with the medium.
  18. nutrient medium (pl.: nutrient media) A solid, semi-solid or liquid formulation for in vitro cell or tissue growth.