Biotechnology and Genetics — page 40 of 40

3,925 terms including subtopics (0 terms filed directly here)

Subtopics

Biotechnology and Genetics terms

  1. xerophyte A plant very resistant to drought, typically adapted to extremely dry environments.
  2. xylem A complex tissue specialized for the conduction of water and mineral nutrients in solution.
  3. Y chromosome See: sex chromosome.
  4. YAC Abbreviation for yeast artificial chromosome.
  5. yeast A unicellular ascomycete fungus, commonly found as a contaminant in plant tissue culture.
  6. yeast artificial chromosome (Abbreviation: YAC ). A vector which can be propagated in budding yeast (Saccharamyces pombe), consisting of the minimal elements required for a…
  7. Yeast artificial chromosome (YAC) Extremely large segments of DNA from another species spliced into DNA of yeast.
  8. yeast episomal vector (Abbreviation: YEp). A cloning plasmid vector for the yeast Saccharomyces cerevisiae maintained as an extrachromosomal nuclear DNA molecule.
  9. yeast extract A mixture of substances from yeast. See: organic complex ..
  10. Yolk sac Vital to the embryo for the formation of primordial and other cells that form the embryo. In mammals, it is small and devoid of a yolk.
  11. Z-DNA A region of DNA that is "flipped" into a lefthanded helix, characterized by alternating purines and pyrimidines, and which may be the target of a…
  12. zig-zag DNA See: Z-DNA.
  13. zinc finger A DNA-binding protein motif, characterized by two closely spaced cysteine and two histidine residues that serve as ligands for a single Zn2+ ion.
  14. Zinc-finger protein A secondary feature of some proteins containing a zinc atom; a DNA-binding protein.
  15. Zona pellucida A thick, transparent noncellular layer that surrounds and protects the oocyte.
  16. zone of elongation The section of the young root or shoot just behind the apical meristem, in which the cells are enlarging and elongating rapidly.
  17. zoo blot Hybridization of cloned DNA from one species to DNA from a range of other organisms to determine the extent to which the cloned DNA is evolutionarily…
  18. zoo FISH Fluorescence in situ hybridization technique, probing metaphase chromosome s of one species with DNA from another species.
  19. Zoonosis A disease that naturally occurs in animals that can also occur in humans.
  20. zoospore A spore that possesses flagella and is therefore motile.
  21. zygonema Stage of meiotic prophase during which chromosome synapsis occurs.
  22. zygospore A thick-walled resistant spore developing from a zygote resulting from the fusion of gamete s in the course of isogamy.
  23. Zygote The diploid cell formed by the fusion of two haploid gamete s during fertilization in eukaryotic organisms with sexual reproduction.
  24. zygotene (adj.) See: zygonema.
  25. zymogen Inactive enzyme precursor that after secretion is chemically altered to the active form of the enzyme.