Members of which group are thought to be the closest relatives of the animals? A
ID: 278580 • Letter: M
Question
Members of which group are thought to be the closest relatives of the animals? A) Euglenozoans B) Choanoflagellates c) Stramenopiles D) Alveolates E) Chlorophytes 92. Why are actinobacteria important? A) They are photoheterolrophs. B) They are the source of many important antibiotics. C) They are Gram-negative bacteria. D) They were once classified as protists. E) They are the only bacteria that divide by mitosis. factor that determines the consequences of a bacterial infection for the host is the ability of the us to the tissues of the host. The anthrax-causing bacterium to produce chemical su bacterium Bacillus anthracis, produces few toxins; however, it can multiply readily and ultimately invades the entire bloodstream. We say such a bacterium has A) low invasiveness and high toxigenicty B) high invasiveness and high toxigenicity C) low invasiveness and low toxigenicity. D) high invasiveness and low toxigenicity 94. Why is the protein cytochrome c important in the study of molecular evolution? A) It is found in all eukaryotes. B) Its mutation rate is very low C) Its mutation rate fluctuates to a great extent D) It is found in all animals. E) All of its mutations are adaptive changes.Explanation / Answer
91. B) Choanoflagellates. Choanoflagellates are single-cell, flagellated, bacteria eating organisms. They lie between fungi and animals on the phylogenetic tree of life.
92. B) They are the source of many important antibiotics. Examples: Tetracycline, Vancomycine, Neomycine.
93. D) high invasiveness and low toxigenicity.
94. E) All of its mutations are adaptive changes.