LS 3 2006 Sample test - 1 Living organisms on earth can be...

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1. Living organisms on earth can be generally classified into three groups, Eukaryota, Eubacteria, and Archaea. What of the following best describes these groups? A). Eubacteria are prokaryotic whereas Archaea are eukaryotic organisms B). Archaea genomes contain multiple linear chromosomes C). Bacterial genomes are usually as complex as chloroplast genomes D). Eubacteria genomes usually contain circular DNA 2. From what you have learned about model organisms, what of the following statements is not true? A). Treatments for human diseases may come from studies of Arabidopsis B). Availability of genome sequences greatly facilitates biological researches C). Studies of fly and worm cannot help improving human health D). Basic research that not directly related to study of human disease has contributed significantly to our understanding and treatment of human disease 3. Radioisotopes are often used in molecular biology studies. Select the statement in the following that is incorrect about radioisotopes 4. Noncovalent bonds are among the most important atomic interactions that help stabilizing the 3- D structure of proteins. What in the following best describes a noncovalent bond? 5. Amino acids are characterized by their chemical properties. What in the following statements about amino acids is incorrect?
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