Biology 101

Card Set Information

Author:
April~Nicole
ID:
84102
Filename:
Biology 101
Updated:
2011-05-05 22:43:42
Tags:
Biology
Folders:

Description:
sample questions
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user April~Nicole on FreezingBlue Flashcards. What would you like to do?


  1. An change in a population is:
    • 1.an outcome of evolution
    • 2.An inhertied trait that increases the chance of survival
    • 3.a result of natural selection
  2. Variations in phenotype within a population are primarily due to _____.
    different combinations of alleles in individuals
  3. Two or more slightly different molecular forms of a gene are called _____.
    alleles
  4. New alleles are created by _____.
    mutation
  5. Mutations affect a population by _____.
    causing random changes slowly over time
  6. Antibiotic resistance is caused by _____.
    • 1.selection based on natural variation
    • 2.antibiotics fed to livestock
    • 3.drugs being overprescribed, especially if they are not needed or patients do not finish the course of treatment
  7. An endangered species that is allowed to recover its former numbers is expected to be
    homozygous for many alleles
  8. biologists define evolution as
    heritable change in a line descent
  9. evolution can only occur in a population when
    • x. mating is random
    • x. there is selection pressure
    • neither is necessary
  10. stabilizing selection tends to
    • eliminate extreme forms of a trait
    • favor intermediate forms of a trait
  11. disruptive selection tends to
    • favor extreme forms of a trait
    • elimate intermediate forms of a trait
  12. directional selection tends to
    shift allele frequencies in one direction
  13. sexual selection, such as competition between males for access to fertile females, frequently influences aspects of body form and can lead to
    • male aggression
    • sexual dimorphism
  14. the persistence of the sickle allele at high frequency in a population is a case of
    balanced polymorphism
  15. ___ tends to keep different populations of a species similar to one another
    gene flow
  16. a fire devastates all tree in a wide swath of forest. populations of a species of tree-dwelling frog on either side of the burned area diverge to become separate species. this is an example of
    allopatric speciation
  17. cladistics is based on
    • reconstructing evolutionary relationships
    • grouping species on the basis of shared characters
  18. in evolutionary trees, each node represents
    a divergence
  19. in cladograms, sister groups are
    the same age
  20. ___ can lead to interdependent species
    coevolution
  21. ___ changes in a population's allele
    genetic drift
  22. ___ alleles enter and leave a population
    gene flow
  23. ___ evolutionary history
    phylogeny
  24. ___ occurs in different patterns
    natural selection
  25. ___ burst of divergences from one lineage into a set of niches
    adaptive radiation
  26. ____ source of new alleles
    mutation
  27. ___ diagram of sets within sets
    cladogram
  28. an abundance of ___ in the atmosphere would have prevented the assembly of complex organic compounds
    oxygen
  29. stanley miller's experiment demostrated
    that amino acids can assemble under some conditions
  30. the evolution of ___ resulted in an increase in the amount of oxygen in the atmosphere
    photosynthsis
  31. mitochondria are most likely descendants of
    aerobic bacteria
  32. bacteria transfer genes to a partner cell by
    conjugation
  33. the first eukaryotes were
    protists
  34. some protists are more related to plants than to other protists
    true
  35. freshwater protists have a ___ that expels excess water
    contractive vacuole
  36. the ___ are parasitic eukaryotes that live in other cells
    apicomplexans
  37. remains of ___ form chalk and limestone deposits
    foraminiferans
  38. some of the ___ are human pathogens
    flagellated protozoans
  39. green algae are most closely related to ___ algae
    red
  40. silica-rich remains of ___ are used as an insecticide
    diatoms
  41. the genetic material of a ___ may be DNA or RNA
    virus
  42. ___ prootist population explosion
    algal bloom
  43. ___ social amoeba
    slime mold
  44. ___ most diverse prokaryotes
    bacteria
  45. ___ noncellular infectious agent
    virus
  46. ___ include the largest protists
    brown algae
  47. ___ flagellate with chloroplasts
    euglenoid
  48. ___ closest relative of plants
    green algae
  49. ___ layered prokaryotes and sediment
    stromatolite
  50. ___ resistant resting stage
    endospore
  51. ___ whirling cell
    dinoflagellate
  52. which of the following statements is not correct
    • a. gymnosperms are the simplest vascular plants
    • b. bryophytes are nonvascular plants
    • c. ferns and angiosperms are vascular plants
    • d. only angiosperms produce flowers
  53. which does not apply to gymnosperms or angiosperms
    • vascular tissues
    • diploid dominance
    • single spore type
  54. bryophytes have independent ___ and attached, dependent ___
    • gametophytes
    • sporophytes
  55. ferns are classified as ___ plants
    seedless vascular
  56. the ___ produce flagellated sperm
    ferns
  57. the ___ produced in the male cones of a conifer develop into pollen grains
    ovries
  58. a seed is
    an immature spore
  59. the ___ are the most diverse seedless vascular plants
    ferns
  60. ___ gamete-producing body
    gametophyte
  61. ___ help control water loss
    stomata
  62. ___ "naked" seeds
    bryophyte
  63. ___ spore-producing body
    sporophyte
  64. ___ nonvascular land plant
    bryophyte
  65. ___ seedless vascular plant
    horsetail
  66. ___ flowering plant
    angiosperm
  67. all fungi
    are herterotrophs
  68. saprobic fungi derive nutrients from
    nonliving organic matter
  69. a mushroom is
    a reproductive structure that releases sexual spores
  70. a ___ is a fungus-plant root partnership
    my corrhiza
  71. a ___ is a composite organism composed of a fungus and a single-celled photosynthetic species
    lichen
  72. fungal skin infections are often fatal
    false

What would you like to do?

Home > Flashcards > Print Preview