Bio Chp. 19 Warm-up 1

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Bio Chp. 19 Warm-up 1
2012-04-05 00:15:19
Chp 19

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  1. What are prokaryotes?
    The smallest and most common microorganisms that are unicellular organisms and lack a nucleus
  2. For many years, what were prokaryotes called?
  3. What are the two groups of prokaryotes?
    Eubacteria and Archaebacteria
  4. Which type of kingdom of prokaryotes is larger?
  5. What does Eubacteria?
    A wide range of organisms with different lifestyles
  6. Where do Eubacteria live? Examples.
    Almost everywhere. Fresh water, salt water, on land, and on and within the human body
  7. How do Archaebacteria resemble eubacteria?
    Equally small, lack nuclei, and have cell walls
  8. How are Archaebacteria different from Eubacteria?
    Lack the pepidoglycan and have different membrane lipids
  9. What do DNA sequences in key archaebacterial genes suggest?
    That archaebacteria may be the ancestors of eukaryotes
  10. What are the 3 Archaebacteria groups, what they mean, where do they live and give examples.
    • Methonagens, produce methane gas and live in oxygen-free environments (thick mud and digestive tracts of animals)
    • Hlaophiles "salt lovers" live in extremely salty environments, 10X saltier than sea water (Great Salt Lake and the Dead Sea)
    • Thermoacidophiles "lover of hot acidic environments" thrive in hot and acidic environments (Yellowstone sulfur hot springs)
  11. What can Prokaryotes be identified by?
    Shape, chemical nature of their cell walls, the way they move, and the way they obtain energy
  12. What can you identify all bacteria by?
    • Rod-shaped prokaryotes called bacilli
    • Spherical prkaryotes called cocci
    • Spiral and corkscrew-shaped prokaryotes called spirilla
  13. Where are two different types of cell walls found?
  14. What is used to tell Eubacteria from Archaebacteria apart?
    Staining method called Gram staining
  15. With Gram staining, how do you know its Eubacteria?
    When it retains the dark color of the violet stain
  16. Why does Eubacteria retain the violet stain color?
    Because it has thick peptidoglycan walls that bond to the stain so it doesn't wash away
  17. What happens when you test an Archaebacteria?
    The violet stain washes away leaving it a pink or light red color
  18. Why does Archaebacteria not retain the violet stain color?
    Because it does not have peptidoglycan in its cell walls to bond with the stain so instead it just washes away
  19. List the four ways prokaryotes can move?
    • Some don't move at all
    • Some are propelled by flagella, whiplike structures
    • Other prokaryotes lash, snake, or spiral forward
    • Others glide slowly along a layer of slimelike material they secrete (produce)
  20. What are heterotrophs?
    Organisms that get their energy from consuming organic molecules made by other organisms
  21. What are the two types of heterotrophs? Explain.
    • Chemoheterotrophs: must take in organic molecules for both enery and a supply of carbon (most animals, humans)
    • Photoheterorophs: photosynthetic but also need to take in organic compounds as a carbon source
  22. What are autotrophs?
    Organisms that make thier own food from organic molecules
  23. What are the two types of autotrophs? Explain.
    • Photoautotrophs: use light energy to convert carbon dioxide and water to carbon compounds and oxygen
    • Chemoautotrophs: make organic carbon molecules from carbon dioxide, use energy directly form chemical reactions involving ammonia, hydrogen sulfide, nitrites, sulfur, or iron. Some live deep in darkness of ocean getting energy from hydrogen sulfide gas that flows from hydrothermal vents