Which of the following is not a human use of microorganisms? A baking bread B. t
ID: 83128 • Letter: W
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Which of the following is not a human use of microorganisms? A baking bread B. treating water and sewage C. fruit production D. antibiotics E. up oil spills Disease-causing microorganisms are called A. decomposers. B. prokaryotes. C. pathogens. D. eukaryotes. E. fermenters Using microbes to detoxify a site contaminated with heavy metals is an example of A. biotechnology, B. bioremediation. C. decomposition. D. immunology E. epidemiology. Which of the following is a unique characteristic of viruses that distinguishes them from the other major groups of microorganisms? A. cause human disease B. lack a nucleus C. cannot be seen without a microscope D. contain genetic material E. lack cell structure Which group of microorganisms is composed only of hereditary material wrapped in a protein covering? A. viruses B. bacteria C. parasites D. fungi E. yeasts The Dutch merchant who made and used quality magnifying lenses to see and record microorganisms was A. Francesco Redi. B. Antonie van Leeuwenhoek. C. Louis Pasteur.Explanation / Answer
I shall answer the first four questions.
Ans 6. c. Fruit production .
Most micro-organisms are involved in either fruit ripening or fruit spoilage. Not in production of fruits.
Ans 7. c. Pathogens.
Decomposers feed on dead organisms, while fermenters help in anaerobic respiration and production of food products. Prokaryotes and eukaryotes are two types of living organisms, without and with nucleus respectively.
Ans 8. b. Bioremediation
This process utilises micro-organisms to break down hazardous and toxic substances to non toxic substances.
Ans 9. e. Lack cell structure.
It is believed that viruses must have evolved from parasitic cells that lost their cell structure. Hence they cannot be classified into any existing kingdom of organisms.
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