Three-Domain System
Biology ⇒ Biological Classification
Three-Domain System starts at 11 and continues till grade 12.
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Describe how the Three-Domain System has impacted our understanding of evolutionary relationships among organisms.
Describe one reason why the Three-Domain System was proposed.
Describe one similarity and one difference between Bacteria and Archaea.
Explain how molecular data, such as rRNA sequences, contributed to the development of the Three-Domain System.
Explain the significance of ribosomal RNA (rRNA) in the classification of organisms into three domains.
Explain why the Three-Domain System is considered more accurate than the Five-Kingdom System.
Explain why viruses are not included in the Three-Domain System.
A scientist is analyzing the ribosomal RNA sequences of an unknown organism and finds that they are more similar to those of Eukarya than to Bacteria. Based on this information, to which domain is the organism most likely related?
Which of the following domains contains organisms with introns in their genes?
(1) Bacteria
(2) Archaea
(3) Eukarya
(4) Both 2 and 3
Which of the following domains includes organisms that can survive in extreme environments such as hot springs and salt lakes?
(1) Bacteria
(2) Archaea
(3) Eukarya
(4) Protista
Which of the following is a correct statement about the Three-Domain System?
(1) It classifies all life forms into three kingdoms
(2) It is based on cell wall composition only
(3) It recognizes fundamental differences in rRNA sequences
(4) It includes viruses as a domain
Which of the following is a reason why Archaea were separated from Bacteria in the Three-Domain System?
(1) Similar cell wall structure
(2) Similar rRNA sequences to Eukarya
(3) Both are photosynthetic
(4) Both have linear chromosomes
Fill in the blank: Eukaryotic cells have their genetic material enclosed within a ________.
Fill in the blank: The domain ________ includes organisms such as methanogens and halophiles.
Fill in the blank: The three domains are Bacteria, ________, and Eukarya.
Fill in the blank: The Three-Domain System is a ________-level classification above the kingdom level.
True or False: All Archaea are extremophiles.
True or False: All members of the domain Bacteria are pathogenic.
True or False: All prokaryotes belong to the domain Bacteria.
True or False: Archaea are more closely related to Eukarya than to Bacteria.
