General Biology: Definitions and explanations page 5 PDF | Download eBooks

Learn general biology terms with definitions and explanations, biology terminologies (Page 5) for biology degree programs.


  1. What are Deuteromycetes?
    Deuteromycota are also known as imperfect fungi. basically these are those fungi which do not fit ...
  2. What is Development?
    Living organisms undergo growth and development. every living organism begins life as a single cell. unicellular ...
  3. What is Diabetes Mellitus?
    Diabetes mellitus (dm), commonly known as diabetes, is a group of metabolic disorders characterized by high ...
  4. What is Diaphragm?
    The diaphragm is a thin skeletal muscle that sits at the base of the chest and ...
  5. What is Diastole?
    Diastole is the part of the cardiac cycle during which the heart refills with blood after ...
  6. What are Diatoms?
    Diatoms are a major group of algae, specifically microalgae, found in the oceans, waterways and soils ...
  7. What are Dicots?
    The dicotyledon plants are also called as dicots (or more rarely dicotyls). these are one of ...
  8. What is Differential gene expression?
    Differential gene expression is the expression of only those genes that are needed in the cell. ...
  9. What is Differentiation?
    Cellular differentiation is the process where a cell changes from one cell type to another. usually, ...
  10. What is Diffusion?
    Diffusion is the movement of molecules from an area of high concentration to an area of ...
  11. What is Digestion?
    Digestion is the breakdown of large insoluble food molecules into small water-soluble food molecules so that ...
  12. What is Digestive system?
    The human digestive system consists of the gastrointestinal tract plus the accessory organs of digestion (the ...
  13. What is Dihybrid cross?
    Dihybrid cross is a cross between two different lines/genes that differ in two observed traits. according ...
  14. What are Dihybrids?
    This term is used to describe a hybrid that is heterozygous for alleles of two different ...
  15. What is Diploid?
    A diploid cell is any cell that contains two complete sets of chromosomes. which means they ...
  16. What is Directional selection?
    Directional selection is common when a population's environment changes or when members of a population migrate ...
  17. What is Disruptive selection?
    A good example of disruptive selection is a population of black-bellied seed cracker finches in cameroon ...
  18. What is DNA cloning?
    Dna cloning is a molecular biology technique that makes many identical copies of a piece of ...
  19. What is DNA excision repair?
    Sometimes dna gets damaged due to certain chemicals or radiations like the uv rays or any ...
  20. What is DNA ligase?
    A ligase is an enzyme that can catalyze the joining of two large molecules by forming ...
  21. What is DNA microarray?
    A dna microarray (also commonly known as dna chip or biochip) is a collection of microscopic ...
  22. What is DNA polymerase I?
    There are three types of polymerase which having overlapping functions. dna polymerase i has several functions ...
  23. What is DNA polymerase III?
    There are three types of polymerase which having overlapping functions however dna polymerase iii has the ...
  24. What is DNA polymerase?
    Dna polymerase is an enzyme that has the important function of synthesizing dna molecules from deoxyribonucleotides ...
  25. What is DNA sequencing?
    Dna sequencing is the process of determining the nucleic acid sequence which is the precise order ...
  26. What is DNA?
    Dna stands for deoxyribonucleic acid. a dna molecule usually carries genetic information in an organism. it ...
  27. What is Dominant allele?
    An allele that has a dominant characteristic and it has the ability to express itself even ...
  28. What is Double circulation?
    In animals with double circulation, the pumps for the two circuits are combined into a single ...
  29. What is Double fertilization?
    Double fertilization is a complex fertilization mechanism of flowering plants (angiosperms). this process involves the joining ...
  30. What is Double helix?
    The term double helix basically refers to the secondary structure formed by the wounding of two ...
  31. What is Down syndrome?
    Down syndrome is an example of a trisomic disorder. down syndrome is the trisomy of chromosome ...
  32. What is Drip irrigation?
    Drip irrigation is a type of micro-irrigation system that has the potential to save water and ...
  33. What is Duplication?
    Gene duplication (or chromosomal duplication or gene amplification) is a major mechanism through which new genetic ...
  34. What is Ecological species concept?
    The ecological species concept is a concept of species in which a species is a set ...
  35. What is Ectoderm?
    Ectoderm is one of the three primary germ layers in the very early embryo. the other ...
  36. What is Ectomycorrhizal fungi?
    Ectomycorrhizal fungi are those that form a symbiotic relationship s a fungal symbiont with the roots ...
  37. What is Ectothermic?
    An ectotherm is an organism in which internal physiological sources of heat are of relatively small ...
  38. What are Effector cells?
    An effector cell is any of various types of cell that actively responds to a stimulus ...
  39. What is Egg?
    The egg is a structure that contains the zygote in which an embryo develops until it ...
  40. What is Ejaculation?
    Ejaculation is the release of semen from the male reproductory tract. the semen contains sperm and ...
  41. What is Electrocardiogram?
    Electrocardiography is the process of producing an electrocardiogram of the electrical activity of the heart using ...
  42. What is Electromagnetic spectrum?
    The electromagnetic spectrum is the range of frequencies of electromagnetic radiation and their respective wavelengths and ...
  43. What is Electron transport chain?
    An electron transport chain is a series of complexes that transfer electrons from electron donors to ...
  44. What is Electronegativity?
    The electronegativity of an atom depends upon the atomic number and the distance of the charged ...
  45. What is Electroporation?
    Electroporation, or electro permeabilization, is a microbiology technique in which an electrical field is applied to ...
  46. What is Element?
    An element is a matter that it made of one type of atoms, all of which ...
  47. What is Elimination?
    Elimination is also defecation. defecation is the final act of digestion, by which organisms eliminate solid, ...
  48. What is Embryo sac?
    Embryo sac is the female gametophyte of a seed plant consisting of a thin-walled sac within ...
  49. What are Enantiomers?
    An enantiomer is one of two stereoisomers that are mirror images of each other that are ...
  50. What is Endergonic?
    An endergonic reaction is a chemical reaction in which the standard change in free energy is ...
  51. What is Endocrine System?
    Endocrine system is responsible for the coordination of body activities such as digestion and metabolism. the ...
  52. What is Endoderm?
    Endoderm is one of the three primary germ layers in the very early embryo. cells migrating ...
  53. What is Endodermis?
    The endodermis is the central, innermost layer of cortex in some land plants. it is made ...
  54. What is Endometriosis?
    Endometriosis is a condition in which cells comparable to those in the the layer of tissue ...
  55. What is Endometrium?
    The endometrium is the internal epithelial layer of the uterus of a mammal.the layer thickens and ...
  56. What are Endophytes?
    An endophyte is an endosymbiont, often a bacterium or fungus, that lives within a plant for ...
  57. What is Endoplasmic reticulum?
    The endoplasmic reticulum is an important organelle found in eukaryotic cells. this structure is absent in ...
  58. What is Endosperm?
    The endosperm is a tissue produced inside the seeds of most of the flowering plants following ...
  59. What is Endospore?
    The original cell produces a copy of its chromosome and surrounds that copy with a tough ...
  60. What is Endosymbiont theory?
    This theory basically describes how a large host cell and ingested bacteria could easily become dependent ...