Discuss how protists can be distinguished from each of the following: bacteria, fungi, plants, and animals
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ANSWER: Protists differ from bacteria simply because they are eukaryotes, and bacteria are
prokaryotes. Protists possess a nucleus and various organelles, all of which are lacking in
bacteria. Protists do have features in common with fungi, animals, and plants. Indeed, these
three eukaryotic lineages arose from protist ancestors. However, protists have several
distinctive characteristics. For example, many protists lack cell walls, while true fungi
possess them. The cell walls that are found in protists typically contain different
components than those found in fungi (cellulose versus chitin). In contrast to land plants,
protists lack highly differentiated structures equivalent to true roots, stems, and leaves.
They also lack the protective structures that encase developing embryos in plants. Finally,
protists are distinguished from animals by their lack of highly differentiated structures such
as limbs and a heart, and by the absence of features such as nerve cells, complex
developmental stages, and an internal digestive tract. Protists also lack collagen, the
characteristic extracellular support protein of animals.
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A mutation is a change in
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The science that seeks to show evolutionary relationships between organisms is
A. phylogeny. B. anatomy. C. taxonomy. D. nomenclature.
Describe a haplotype block
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