AP BIOLOGY

EVOLUTION

THE ORIGIN OF LIFE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
In 1990, Carl Woese introduced the three domain system for classifying living thing, after the advancement of DNA analysis allowed for a comparison of species genetic code. Which of the following is the best explanation for why domains were added to the previous system of classification?
A
The old system of classification was wrong and needed to be corrected.
B
New species are evolving too quickly to keep up with the old system of classification
C
Domains have always been included, they were just made official recently
D
Some organisms, which were previously characterized together, were determined to be genetically very different
Explanation: 

Detailed explanation-1: -Because of Woese’s work, it is now widely agreed that there are three primary divisions of living systems – the Eukarya, Bacteria, and Archaea, a classification scheme that Woese proposed in 1990.

Detailed explanation-2: -The three-domain classification was proposed by Carl Woese in 1990. The Three Domains were Archae, Bacteria, and Eukaryote while the Six Kingdoms were Archaebacteria, Eubacteria, Protista, Fungi, Plantae, and Animalia.

Detailed explanation-3: -The three-domain system emphasizes the similarities among eukaryotes and the differences among eukaryotes, bacteria, and archaea. By using domains, Woese was able to show these relationships without replacing the popular six-kingdom system.

Detailed explanation-4: -The Three Domain System, developed by Carl Woese in 1990, is a system for classifying biological organisms. Before Woese’s discovery of archaea as distinct from bacteria in 1977, scientists believed there were only two types of life: eukarya and bacteria.

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