
Concept explainers
To analyze:
The domain of life of protists and
Introduction:
Classification has several systems, out of which the three-domain system is one. The three-domain system was proposed by Carl Woese and is based on the studies of comparison of rRNA in organisms. Ribosomal RNA or rRNA is a key component of ribosomes and is highly conserved as the rate of mutation is low. Using this system, all organisms were classified as Archaea, Bacteria, and Eukarya of which Eukarya is made of 4 kingdoms which include Protista, Fungi, Plantae, and Animalia.

Explanation of Solution
The most important feature of the domain Eukarya is the presence of a membrane-bound nucleus that contains genetic material. This domain is further divided into plants, animals, fungi, and protists.
The reasons why fungi and protists are in Eukarya domain and they show the following features along with other members of the domain, plants, and animals.
1. The amino acid that initiates translation is methionine.
2. There is a nucleus surrounded by a nuclear envelope.
3. Membrane-bound organelles are present.
4. There is no peptidoglycan in the cell walls.
5. Photoautotrophic members possess membrane-bound organelles known as chloroplasts.
6. In some stage of life, they have eukaryote flagellum of the "9 + 2"-fiber design.
Hence, the domain of protists and fungi was answered as Eukarya along with reasons.
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Chapter 29 Solutions
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