91) What environment stimulates evolution of drug-resistant pathogens? A) presen
ID: 268065 • Letter: 9
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91) What environment stimulates evolution of drug-resistant pathogens? A) presence of an enzyme called penicillinase B) pathogens without cell walls C) excess antibiotics D) colonization of host 92) What is true of pseudogenes? 92) A) They are the same things as introns B) They are vestigial genes (genes that have lost some or all of their ancestral function in a given species) C) They are composed of RNA, rather than DNA D) They are unrelated genes that code for the same gene product. 93) Which of the following observations helped Darwin shape his concept of descent with modification? A) Birds live on islands located farther from the mainland than the birds' maximum nonstop flight distance. B) Fewer species live on islands than on the nearest continents C) Species diversity declines farther from the equator. D) South American temperate plants are more similar to the tropial plants of South America than to the temperate plants of Europe. 94) 94) The first genetic material on early Earth was most likely A) RNA. B) protocells C) DNA 95) The typical prokaryotic flagellum features A) a complex "motor embedded in the ce'll wall and plasma membrane. B) a membrane-enclosed organelle with motor proteins. C) a basal body that is similar in structure to the cell's centrioles 96) 96) Prokaryotes essential genetic information is located in the A) nucleoid. B) flagella. C) plasmids 97) Photoautotrophs use ? A) CO2 as both an energy source and a carbon souroe. B) H25 as an energy source and COp as a carbon source C) light as an energy source and CO2 as a carbon source. 98) All protists are ? B) mixotrophic C) eukaryotic 99) The chloroplasts of all of the following are thought to be derived from ancestral red algae,except 99) those of A) brown algae. B) green algae C) dinoflagellates. 100) The last common ancestor of fungi and animals was most likely a 100) A) multicellular photosynthetic prokaryote. B) single-celled eukaryote. C) colonial photosynthetic prokaryote.Explanation / Answer
91) A) presence of an enzyme called penicillinase
92) B) they are vestigial genes (genes that have lost some or all of their ancestral function in a given species)
93) D) South American temperate plants are more similar to the tropical plants of South America than to the temperate plants of Europe
94) A) RNA
95) A) a complex "motor" embedded in the cell wall and plasma membrane
96) A) nucleoid
97) C) light as an energy source and CO2 as a carbon source
98) C) eukaryotic
99) B) green algae
100) B) single-cell eukaryotic
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