7. Which of the following is true about viruses? a) They are not composed of cel

Question

7. Which of the following is true about viruses? a) They are not composed of cells b) They cannot metabolize nutrients c) They cannot reproduce themselves d) They have DNA or RNA e) All of the above 8. Which of the following is probably true about all of the experiments that proved spontaneous generation? a Air was lacking b) Too much heat was applied c) Food source could not support life d) Microorganisms were already present e) All of the above Recombinant DNA is: a) DNA in bacteria b) The study of how genes work c) The DNA resulting when genes of two different organisms are mixed d) The use of bacteria in production of foods e) The production of proteins by genes. 9. Which of the following statements is the best definition of biogenesis? a Nonliving matter gives rise to living organisms b) A vital force is necessary for life c) Living cells can only arise from preexisting living cells d) Air is necessary for living organisms 10. e) Microorganisms can be generated from nonliving matter 11. Which of the following is a beneficial activity of microorganisms? a) Some microorganisms are used as food for humans b) Some microorganisms produce oxygen c) Some microorganisms provide nitrogen for plant growth d) Some microorganisms are used in sewage treatment processes e) All of the above

Explanation / Answer

7) Option E is correct. All of the above is true about viruses.

8) Option D is correct. Microorganisms were already present.

9) Option C is correct. Recombinant DNA is the DNA resulting when genes of two different organisms are mixed.

10) Option C is correct. The best definition of biogenesis is that living cells can only arise from preexisting cells.

11) Option E is correct. Beneficial activity of microorganisms include all of the above

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