General Biology: Definitions and explanations page 8 PDF Book

Learn general biology terms with definitions and explanations, biology terminologies (Page 8) for biology degree programs.


  1. What is Heat shock proteins?
    Heat shock proteins are a family of proteins that are produced by cells in response to ...
  2. What is Heat?
    The energy transferred between two substances at different temperatures is called heat. heat is usually measured ...
  3. What is Helicase?
    Several enzymes participate in the dna replication process including helicase. these are one of the important ...
  4. What is Hemoglobin?
    Hemoglobin is the iron-containing oxygen-transport metalloprotein in the red blood cells (erythrocytes) of almost all vertebrates. ...
  5. What is Hemolymph?
    Hemolymph, or hemolymph, is a fluid, analogous to the blood in vertebrates, that circulates in the ...
  6. What is Hemophilia?
    Hemophilia is a bleeding disorder that slows the blood clotting process. people with this condition experience ...
  7. What is Hepatic portal vein?
    The portal vein or hepatic portal vein is a blood vessel that carries blood from the ...
  8. What is Herbivores?
    A herbivore is an animal anatomically and physiologically adapted to eating plant material, for example foliage ...
  9. What are Hermaphrodites?
    A hermaphrodite is an organism that has complete or partial reproductive organs and produces gametes normally ...
  10. What is Hermaphroditism?
    A hermaphrodite is an any living organism that has incomplete reproductive organs or may have reproductive ...
  11. What is Heterochromatin?
    Heterochromatin is a tightly packed form of dna or condensed dna, which comes in multiple varieties. ...
  12. What is Heterochrony?
    In evolutionary developmental biology, heterochrony is a developmental change in the timing or rate of events, ...
  13. What is Heterokaryon?
    A heterokaryon is a multinucleate cell that contains genetically different nuclei. ...
  14. What are Heterotrophs?
    A heterotroph is an organism that cannot manufacture its own food by carbon fixation and therefore ...
  15. What is Heterozygote advantage?
    A heterozygote advantage describes the case in which the heterozygous genotype has a higher relative fitness ...
  16. What is Heterozygous?
    Heterozygous is a diploid organism when at a particular gene locus has two different alleles (one ...
  17. What is Hibernation?
    Hibernation is a state of inactivity and metabolic depression in endotherms. hibernation refers to a season ...
  18. What is High density lipoprotein?
    High-density lipoprotein is one of the five major groups of lipoproteins. they are typically composed of ...
  19. What is Highly conserved?
    Sequences or features that have remained the same over a long period of time are said ...
  20. What is Histamine?
    Histamine is an organic nitrogenous compound involved in local immune responses, as well as regulating physiological ...
  21. What is Histone?
    Histones are highly alkaline proteins found in eukaryotic cell nuclei. these are not usually seen in ...
  22. What is Homeostasis?
    Homeostasis is the state of steady internal physical and chemical conditions maintained by living systems. this ...
  23. What is Homeotherm?
    Warm-blooded animal species can maintain a body temperature higher than their environment. in particular, homeothermic species ...
  24. What are Homeotic genes?
    Homeotic genes are genes which regulate the development of anatomical structures in various organisms such as ...
  25. What are Hominins?
    Hominins are any species of early human that is more closely related to humans than chimpanzees, ...
  26. What are Homologous structures?
    A homologous structure is an example of an organ or bone that appears in different animals, ...
  27. What are Homologs?
    Homologs is another name for homologous chromosomes. it is a pair of chromosomes having the same ...
  28. What is Homology?
    Homology is the existence of shared ancestry between a pair of structures, or genes, in different ...
  29. What are Homoplasies?
    A homoplasy is a character shared by a set of species but not present in their ...
  30. What is Homozygous?
    Homozygous is a word that refers to a particular gene that has identical alleles on both ...
  31. What is Horizontal gene transfer?
    Horizontal gene transfer or lateral gene transfer is the movement of genetic material between unicellular and/or ...
  32. What are Hormones?
    Hormones are distinct chemical messengers in the body that are formed in the endocrine glands and ...
  33. What is Host range?
    Host range is all the organisms of the hosts that a virus can infect. the host ...
  34. What is Host?
    Host is the usually the larger organism in the symbiosis and provides food and nourishment to ...
  35. What is Human Immunodeficiency Virus?
    Hiv virus has an elaborate pathogenesis. once introduced into the body, hiv infects helper t cells ...
  36. What is Human Nervous System?
    The nervous system is a very intricate part of an animal that manages its actions and ...
  37. What is Humoral immune response?
    Humoral immunity refers to antibody production and the accessory processes that accompany it. basically humoral immunity ...
  38. What is Humus?
    Humus denominates the fraction of soil organic matter that is amorphous and without the "cellular cake ...
  39. What is Hybrid zone?
    Hybrid zones are areas where the hybrid offspring of two divergent taxa are prevalent and there ...
  40. What is Hybridization?
    When plants of different varieties are bred together, the process is termed is hybridization. this is ...
  41. What is Hydration shell?
    A solvation shell is the solvent interface of any chemical compound or biomolecule that constitutes the ...
  42. What are Hydrocarbons?
    Hydrocarbon is an organic compound consisting entirely of hydrogen and carbon. hydrocarbons are examples of group ...
  43. What is Hydrogen bond?
    The bond that is formed between a hydrogen atom that shares the electron with any atom ...
  44. What is Hydrolysis?
    The term hydrolysis can be used for electrochemical as well as biological reactions. hydrolysis reaction occurs ...
  45. What is Hydrophobic?
    Any substance that repels water or is not dissolved in water. hydrophobic molecules tend to be ...
  46. What is Hydroponic culture?
    Hydroponics is a method of growing plants in a water based, nutrient rich solution. hydroponics does ...
  47. What are Hydrothermal vents?
    A hydrothermal vent is a fissure on the seafloor from which geothermally heated water issues. hydrothermal ...
  48. What is Hypersensitive response?
    The hypersensitive response (hr) is a mechanism, used by plants, to prevent the spread of infection ...
  49. What is Hypertension?
    Hypertension is yet another contributor to heart attack and stroke. according to one hypothesis, chronic high ...
  50. What is Hypertonic?
    Hypertonic refers to a solution with higher osmotic pressure than another solution. in other words, a ...
  51. What is Hypothalamus?
    The hypothalamus is a portion of the brain that contains a number of small nuclei with ...
  52. What is Hypothesis?
    A hypothesis is a proposed explanation for a phenomenon. for a hypothesis to be a scientific ...
  53. What is Hypotonic?
    Any body that has higher osmotic pressure as the other body. there will be net movement ...
  54. What is Imbibition?
    Imbibition is a special type of diffusion when water is absorbed by solids-colloids causing an enormous ...
  55. What is Immune and lymphatic system?
    Body defense (fighting infections and cancer). ...
  56. What is Immune rejection?
    A good example of immune rejection is the skin transplanted from one person to a genetically ...
  57. What is Immune system?
    The immune system is a host defense system comprising many biological structures and processes within an ...
  58. What is Immunization?
    Immunization is the process by which an individual's immune system becomes encouraged or strengthens against an ...
  59. What is In situ hybridization?
    In situ hybridization (ish) is a type of hybridization that uses a labeled complementary dna, rna ...
  60. What is In vitro mutagenesis?
    In vitro mutagenesis is a site-directed mutagenesis allows various types of directed changes to be made ...