BIO250 EXAM 6 Unit 24 Genetic Engineering and Recombinant DNA[ GRADED A+]

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Page path  BIO250_Saylor_V5  Unit 24: Genetic Engineering and Recombinant DNA Started on Wednesday, October 13, 2021, 10:37 AM State Finished Completed on Wednesday, October 13, 2021, 11:02... AM Time taken 25 mins 18 secs Grade 85.50 out of 90.00 (95%) Question 1 Correct 4.50 points out of 4.50 Flag question Question text Eutrophication Select one: a. is characterized by heavy surface algal blooms. b. restricts the O2 supply to water below the surface. c. occurs when there are excess nutrients in aquatic ecosystems. d. causes massive die-off of fish and invertebrates. e. All of the choices are correct. Question 2 Correct 4.50 points out of 4.50 Flag question Question text Considering the human body as an ecosystem, which of the following statements is incorrect? Select one: a. Microbes act as producers, consumers, and decomposers within the human ecosystem. b. Energy for the human microbiome derives exclusively from the food we eat. c. The microbiota in the human gut is comprised of heterotrophs. d. The human ecosystem lacks an autotrophic niche. Question 3 Correct 4.50 points out of 4.50 Flag question Question text Plastic marine debris was collected from multiple sites in the ocean and examined with electron microscopy and next-generation sequencing. These techniques revealed microbial communities growing on the plastics. Which of the following statements is correct regarding these communities? Select one: a. At least one member of the community must synthesize an enzyme to degrade the hydrocarbon comprising the plastic. b. The community within the plastic must be very similar to the community in the surrounding ocean waters. c. There are no bacteriophage that use these microbes as hosts, as viruses are rare in marine ecosystems. d. These communities are very likely to be pure cultures, as plastics have been synthesized precisely because they are resistant to microbial degradation. [Show More]

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