BI 253 Chapter1

Card Set Information

Author:
medic11
ID:
172820
Filename:
BI 253 Chapter1
Updated:
2012-09-23 16:49:52
Tags:
BI 253
Folders:

Description:
Ch 1 9-23-12
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user medic11 on FreezingBlue Flashcards. What would you like to do?


  1. What are the 5 characteristics that living things share?
    • 1 or more organized cells
    • Environmental interaction
    • Contain heritable genetic info
    • Are genetically related & have evolved
    • Can regulate internal environ
  2. Cells are the ___ ___ of ___.
    Basic units of life
  3. What is an organ system?
    Grp of organs that function together
  4. What does a population consist of?
    Organisms of the same species living together
  5. What does a community consist of?
    Several unrelated populations living together
  6. Define ecosystem.
    A community & its physical environment
  7. What is the biosphere?
    Part of the earth where biological activity occurs
  8. The ____ is the ultimate source of energy available to life on earth.
    Sun
  9. Metabolism is . . . .
    • A process where organism’s transform & use energy & molecules
    • Convert molecules fr environment into new biological molecules
    • Extract energy fr environment & use it to do biological work
  10. All organisms need ____ to provide the energy they need to live.
    Food
  11. DNA is known as the what?
    Blueprint of life
  12. DNA carries a genetic code or genome which does what?
    Directs production of essential molecules that perform specific functions of life
  13. The units of genetic code is stored in units called ____.
    Genes
  14. How are genes passed on fr generation to generation?
    Through reproduction - sexual or asexual
  15. A theory is defined as . . . .
    A general set of principles supported by evidence that explains some aspect of nature
  16. Can a theory be modified?
    If compelling evidence arises a theory may be modified
  17. A theory is more like a ___ or ___ ___.
    Principle or natural law
  18. T or F - A theory is extensively & reproducibly tested
    True
  19. What are 2 ideas of "descent with modification?"
    • 1. Organisms alive today are descended fr those alive long ago
    • 2. All organisms have common characteristics b/c they are related to one another
  20. What is the primary principle of "survival of the fittest?"
    Organisms w/any trait that increases probably that its owner will survive & produce more offspring
  21. Define Homeostasis.
    An organisms ability to maintain a steady internal state in spite of external changes
  22. A negative feedback loop promotes ____.
    Homeostasis
  23. Taxonomy is the . . . .
    Science of classifying & naming organisms
  24. ___ ___ is a 2 named sys used t classify living organisms
    Binomial Nomenclature
  25. A genus is an . . .
    Organism with a common ancestor comprised of similar species
  26. A species is a what?
    Grp of organisms capable of interbreeding & producing fertile offspring
  27. Finish the following Domain, Kingdom, Phylum, ___, ___, ___, ___ & ___.
    Class, Order, Family Genus & Species
  28. What are the 3 domains of living things?
    • Archaea
    • Bacteria
    • Eukarya
  29. Describe Archaea.
    • Single celled prokaryotic organisms found in extreme habitats
    • No membrane bound nucleus or organelles
  30. Describe Bacteria.
    • Single celled prokaryotic organisms that live everywhere
    • No membrane bound nucleus or organelles
  31. Give 3 characteristics of Eukarya.
    • Unicellular or Multicellular
    • Have nucleus & membrane bound organelles
    • More complex than prokaryotes
    • Divided into 4 kingdoms-protista, fungi, plantae, animalia
  32. What are the 4 main Kingdoms of Eukarya?
    • Protista
    • Fungi
    • Plantae
    • Animalia
  33. Define Symbiosis.
    2 organisms working together to help each other out
  34. Give some characteristics of heterotrophs.
    • Obtain food fr environment
    • Consumers
  35. Give some characteristics of autotrophs.
    • Create energy fr inorganic sources
    • Producers
    • Utilize photosynthesis
  36. Explain decomposers.
    • Heterotrophs
    • Break down dead or decaying organisms
    • Carries out natural process of decomposition
  37. Prokaryotic cells have what characteristics
    • Lacks membrane enclosed nucleus & organelles
    • Called prokaryotes (bacteria & archaea)
  38. Give 4 characteristics of protists.
    • Eukaryotic
    • Single celled (amoeba, paramecium)
    • Means "1st animals"
    • Often diseases - amebic dysentery, Malaria
  39. Give 5 characteristics of funji.
    • Eukaryotic
    • Most multicellular
    • Some unicellular (yeasts)
    • Absorptive heterotrophs (decomposers)
    • Can cause disease - tineas
  40. Give 4 characteristics of plantae.
    • Eukaryotic
    • Multicellular
    • Autotrophs - photosynthesis
    • Often used in medicine (ASA)
  41. Give 4 facts about animalia.
    • Eukaryotic
    • Includes worms, insects, mammals, fish etc
    • Heterotrophs - consumers
    • Divided into vertibrates & invertibrates

What would you like to do?

Home > Flashcards > Print Preview