Section 18-1 Finding Order in Diversity
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1 Name Class Date Section 18-1 Finding Order in Diversity (pages ) Key Concepts How are living things organized for study? What is binomial nomenclature? What is Linnaeus s system of classification? Why Classify? (page 447) 1. Why do biologists use a classification system to study the diversity of life? 2. The science of classifying organisms and assigning them universally accepted names is known as Assigning Scientific Names (page 448) 3. Why is it confusing to refer to organisms by common names? 4. The two-word naming system developed by Linnaeus is called 5. Circle the letter of each sentence that is true about binomial nomenclature. a. The system is no longer in use today. b. Each species is assigned a two-part scientific name. c. The scientific name is always written in italics. d. The second part of the scientific name is capitalized. 6. What is the genus of the grizzly bear, Ursus arctos? Linnaeuss System of Classification (pages ) 7. A group or level of organization in taxonomy is called a taxonomic category, or 8. The largest taxonomic category in Linnaeus s system of classification is the and the smallest is the 9. What two kingdoms did Linnaeus name?
2 10. Fill in the name of each missing taxonomic category in the chart below. Grizzly bear Black bear Giant panda Red fox Abert Coral squirrel snake Sea star KINGDOM Animalia Chordata Mammalia Carnivora Ursidae Ursus SPECIES Ursus arctos Section 18-2 Modern Evolutionary Classification (pages ) Key Concepts How are evolutionary relationships important in classification? How can DNA and RNA help scientists determine evolutionary relationships? Introduction (page 451) 11. What traits did Linnaeus consider when classifying organisms? Which Similarities Are Most Important? (page 451) 12. What problems are faced by taxonomists who rely on body-structure comparisons?
3 Evolutionary Classification (page 452) 13.Is the following sentence true or false? Darwin s theory of evolution changed the way biologists thought about classification. 14.How do biologists now group organisms into categories? 15. The strategy of grouping organisms together based on their evolutionary history is called. Classification Using Cladograms (page 453) 16. Circle the letter of each sentence that is true about cladistic analysis. a. It considers only traits that are evolutionary innovations. b. It considers all traits that can be measured. c. It considers only similarities in body structure. d. It is a method of evolutionary classification. 17. A diagram that shows the evolutionary relationships among a group of organisms is called a(an). Similarities in DNA and RNA (page 454) 18. Is the following sentence true or false? Some organisms do not have DNA or RNA. 19. How do similarities in genes show that humans and yeasts share a common ancestry? Molecular Clocks (page 455) 20. A model that uses DNA comparisons to estimate the length of time that two species have been evolving independently is known as a(an). 21. A molecular clock relies on the repeating process of. 22. Is the following sentence true or false? The degree of dissimilarity in DNA sequences is an indication of how long ago two species shared a common ancestor. 23. Why are there many molecular clocks in a genome instead of just one?
4 Section 18-3 Kingdoms and Domains (pages ) Key Concepts What are the six kingdoms of life as they are now identified? What is the three-domain system of classification? The Tree of Life Evolves (pages ) 24. What fundamental traits did Linnaeus use to separate plants from animals? 25. What type of organisms were later placed in the kingdom Protista? 26. Mushrooms, yeast, and molds have been placed in their own kingdom, which is called 27. Why did scientists place bacteria in their own kingdom, the Monera? 28. Complete the concept map. The Six-Kingdom System Animalia includes Archaebacteria
5 The Three-Domain System (page 458) 29. A more inclusive category than any other, including the kingdom, is the 30. What type of analyses have scientists used to group modern organisms into domains? List the three domains: a. b. c. 31. Complete the chart below. Domain Kingdom Examples CLASSIFICATION OF LIVING THINGS Eubacteria Streptococcus, Escherichia coli Archaea Protist Mushrooms, yeasts Plantae Sponges, worms, insects, fishes, mammals Domain Bacteria (page 459) 32. Circle the letter of each sentence that is true about members of the domain Bacteria. a. They are multicellular. b. They are prokaryotes. c. They have rigid cell walls. d. The cell walls contain peptidoglycans. 33. Is the following sentence true or false? All members of the domain Bacteria are parasites. Domain Archaea (page 459) 34. Circle the letter of each sentence that is true about members of the domain Archaea. a. They are unicellular. c. They lack cell walls. b. They are eukaryotes. d. They lack cell membranes. 35. Is the following sentence true or false? Many members of the domain Archaea can survive only in the absence of oxygen.
6 Domain Eukarya (pages ) 36. Circle the letter of each sentence that is true about all the members of the domain Eukarya. a. They have a nucleus. b. They are multicellular. c. They are heterotrophs. d. They have cell walls and chloroplasts. Match each kingdom with the description that applies to members of that kingdom. Kingdom Description 37. Protista a. They have cell walls of chitin. 38. Fungi b. They have no cell walls or chloroplasts. 39. Plantae c. They include slime molds and giant kelp. 40. Animalia d. They include mosses and ferns. Completion Use the words below to fill in the blanks with terms from the chapter. cladogram domain Eubacteria family 41. The kingdom makes up the domain Bacteria. 42. The newest and largest classification category is the 43. A group of genera that share many characteristics is called a(an) 44. A diagram that shows evolutionary relationships among a group of organisms is a(an) Completion Use the words below to fill in the blanks with terms from the chapter. binomial nomenclature kingdom taxonomy genus phylogeny 45.The largest and most inclusive taxon in Linnaeus s system is the 46. A group of closely related species is a 47. The study of evolutionary relationships among organisms is called 48. The science of classifying living things is 49. A system of naming in which organisms are given names made up of two names is called
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