General Biology: Definitions and explanations page 1 PDF Book

Learn general biology terms with definitions and explanations, biology terminologies (Page 1) for biology degree programs.


  1. What is ABC hypothesis?
    The abc model, which aims to describe the biological basis of the process from the perspective ...
  2. What is Abiotic stress?
    The biotic stress is the negative impact of non-living factors on the living organisms in a ...
  3. What is Abortion?
    Abortion is the termination of a pregnancy by removal or eviction of an embryo before it ...
  4. What is Abscisic acid (ABA)?
    Abscisic acid (aba) is a plant hormone. aba functions in many plant developmental processes, including seed ...
  5. What is Abscisic Acid?
    Aba has several functions. it inhibits growth, promotes stomatal closure during drought stress, promotes seed dormancy ...
  6. What is Absorption spectrum?
    Absorption spectrum is the spectrum of electromagnetic radiation transmitted through a substance, showing dark lines or ...
  7. What is Absorption?
    Absorption of nutrients mostly occurs in the small intestine. digestion and absorption begins in your mouth ...
  8. What is Accessory fruit?
    An accessory fruit is a fruit in which some of the flesh is derived not from ...
  9. What is Acclimatization?
    Acclimatization or acclimatization (also called acclimation or acclimatation) is the process in which an individual organism ...
  10. What is Acid?
    A substance that donates the protons and accepts electrons. when an acid is dissolved in aqueous ...
  11. What is Acquired immunodeficiency?
    Drugs used to fight autoimmune diseases or prevent transplant rejection suppress the immune system, leading to ...
  12. What is Acrosome?
    The acrosome is an organelle that develops over the frontal part of the sperm of many ...
  13. What is Action spectrum?
    An action spectrum is a graph of the rate of a physiological activity plotted against wavelength ...
  14. What is Activation energy?
    The activation energy is the energy that is required to start a reaction. this energy must ...
  15. What is Activator?
    Activator is a dna-binding protein that regulates one or more genes by increasing the rate of ...
  16. What is Active immunity?
    Active immunization is the induction of immunity after exposure to an antigen. antibodies are created by ...
  17. What is Active site?
    The active site is the region of an enzyme where substrate molecules bind and undergo a ...
  18. What is Active transport?
    Many proteins facilitate this process as it cannot happen on its own. the movement of molecules ...
  19. What are Adaptations?
    An adaptation is a characteristic of an organism that improves its chances of surviving and/or reproducing. ...
  20. What is Adaptive evolution?
    Evolution in general is a change in the heritable characteristics present in a population. several factors ...
  21. What is Adaptive immunity?
    The adaptive immune system, also known as the acquired immune system or sometimes as the specific ...
  22. What is Adaptive radiation?
    In evolutionary biology, adaptive radiation is a process in which organisms diversify rapidly from an ancestral ...
  23. What is Addition rule?
    When two events, a and b, are mutually exclusive, the probability that a or b will ...
  24. What is Adhesion?
    Adhesion is the ability to adhere to a surface. it can also be described as union ...
  25. What is Adipose tissue?
    Adipose tissue, or fat, is an anatomical term for loose connective tissue composed of adipocytes. its ...
  26. What are Adrenal glands?
    The adrenal glands are an example of endocrine glands. they produce a variety of hormones including ...
  27. What is Aerobic respiration?
    Aerobic respiration is the process that produces cellular energy by using oxygen. cells break down food ...
  28. What is Aggregate fruit?
    An aggregate fruit or etaerio is a fruit that develops from the merger of several ovaries ...
  29. What is Alimentary canal?
    Alimentary canal is the whole passage along which food passes through the body from mouth to ...
  30. What are Alkaline vents?
    In the absence of oxygen, alkaline vents are proposed to have acted as electrochemical flow reactors, ...
  31. What is Allele?
    An allele is a variant form of a gene. some genes have a variety of different ...
  32. What is Allergy?
    Allergies, also known as allergic diseases, are a number of conditions caused by hypersensitivity of the ...
  33. What is Allopatric speciation?
    An example of allopatric speciation is the water level in a lake that subsides, resulting in ...
  34. What is Alloploidy?
    The allopolyploid nucleus also has multiple copies of the genome. this happens when more than the ...
  35. What is Allosteric regulation?
    Allosteric regulation is basically the regulation of an enzyme by binding an effector molecule at a ...
  36. What are Alternation of generations?
    Alternation of generations, which is also known as metagenesis, is the type of life cycle that ...
  37. What is Alternative RNA splicing?
    Alternative splicing, or differential splicing, is a regulated process during gene expression that results in a ...
  38. What is Alveoli?
    The pulmonary alveolus , which are also called alveoli, is a hollow cavity found in the ...
  39. What is Amino acid?
    An organic molecule that is the building block of all proteins. it is an organic molecule ...
  40. What are Aminoacyl-tRNA synthetases?
    An aminoacyl-trna synthetase, also called trna-ligase, is an enzyme that attaches the appropriate amino acid onto ...
  41. What is Amniocentesis?
    Sometimes the fetus can show signs of a disease or a disorder. to screen that, some ...
  42. What are Amoebocytes?
    An amebocyte or amoebocyte is a mobile cell in the body of invertebrates including echinoderms, mollusks, ...
  43. What is Amphipathic?
    The phospholipid is a classical example of an amphipathic molecule that has both the regions. they ...
  44. What is Amylase?
    Amylase is a protein made by our pancreas and also by the glands in and around ...
  45. What are Anabolic pathways?
    Anabolism is the set of metabolic pathways that construct molecules from smaller units. these reactions require ...
  46. What is Anaerobic respiration?
    Anaerobic respiration is respiration using electron acceptors other than molecular oxygen (o2). although oxygen is not ...
  47. What is Analogous features?
    He term analogous structures pertain to the various structures in different species having the same function ...
  48. What is Analogy?
    In biology, similarity of function and superficial resemblance of structures that have different origins are called ...
  49. What is Anatomy?
    Anatomy is the branch of biology concerned with the study of the structure of organisms and ...
  50. What is Aneuploidy?
    Aneuploidy is the presence of an abnormal number of chromosomes in a cell, for example a ...
  51. What are Angiosperms?
    The flowering plants are also known as angiosperms. angiosperms are the most diverse group of land ...
  52. What is Anhydrobiosis?
    The term anhydrobiosis is most usually used for the desiccation acceptance or tolerance seen in certain ...
  53. What is Anion?
    A negatively charged ion is a anion. if kept in a electric field, these ions will ...
  54. What is Anther?
    The part of a stamen that contains the pollen. it is crucial in the reproduction of ...
  55. What is Antibody?
    Antibodies are secreted proteins from the b cells. the antibodies have the same y-shaped structure as ...
  56. What is Anticodon?
    The anticodon region of a transfer rna is a sequence of three bases that are complementary ...
  57. What is Antigen presentation?
    Antigen presentation describes a vital immune process which is essential for t cell immune response triggering. ...
  58. What is Antigen receptor?
    An antigen receptor is basically an antibody protein that is not secreted but is anchored to ...
  59. What is Antigen?
    The term antigen refers to any molecule or a linear molecular fragment after processing the native ...
  60. What is Antiparallel?
    In terms of biology, two biopolymers are antiparallel if they run parallel to each other but ...