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Name: ________________________________
SECTION
17.4
DOMAINS AND KINGDOMS
Study Guide
KEY CONCEPT
The current tree of life has three domains.
VOCABULARY
Bacteria Eukarya
Archaea
MAIN IDEA: Classification is always a work in progress.
1. Why is classification considered a work in progress?
2. How has the kingdom system changed over the last three hundred years?
3. Describe Woese’s discovery and the impact it had on the tree of life.
On the timeline below, fill in the major changes to the kingdom system that have occurred
over the past three hundred years.
1753:
1938: 1977:
1700 1800 1900 2000
1866: 1959:
STUDY GUIDE, CONTINUED
MAIN IDEA: The three domains in the tree of life are Bacteria, Archaea, and Eukarya.
Fill in the table below with notes about the three-domain system.
|Domain |Characteristics |Kingdoms Included |
|4. Bacteria | | |
|5. Archaea | | |
|6. Eukarya | | |
7. Why is it difficult to classify bacteria and archaea down to the species level?
Vocabulary Check
Bacteria Archaea Eukarya
8. Have cells with distinct nucleus and membrane-bound organelles
9. Known for their ability to live in extreme environments
10. Classified by their shape, need for oxygen, and whether they cause disease
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