Micro Chapter 6 100% SOLUTION 2023//2024

Micro Chapter 6 100% SOLUTION 2023//2024 3. Which is not true of viruses? A. They can exist in an intracellular or extracellular phase. B. They infect animal and plant cells only. C. They can be observed with an electron microscope. D. They are acellular. E. They replicate only inside host cells. - ANSWER B. They infect animal and plant cells only. 4. Which of the following is true of viruses in the extracellular phase? A. They possess many different enzymes. B. They can reproduce independently of living cells but only at a slow rate. C. They behave as a macromolecular complex and are no more alive than are ribosomes. D. They possess many different enzymes and they can reproduce independently of living cells but only at a slow rate - ANSWER C. They behave as a macromolecular complex and are no more alive than are ribosomes. 5. A complete virus particle is called a A. capsid. B. nucleocapsid. C. virion. D. cell. - ANSWER C. virion. 6. The nucleic acids carried by viruses usually consist of A. DNA. B. RNA. C. either DNA or RNA. D. both DNA and RNA simultaneously. - ANSWER C. either DNA or RNA. 7. Which of the following is not true of viruses? A. Viruses are acellular. B. Viruses consist of one or more molecules of DNA or RNA enclosed in a coat of protein and sometimes in other more complex layers. C. Viruses can exist in two phases: intracellular and extracellular. D. Viruses replicate by binary fission. - ANSWER D. Viruses replicate by binary fission. 11. Virus morphology does not include which of the following characteristics? A. size B. shape C. presence or absence of an envelope D. host range - ANSWER D. host range 19. The simplest viruses consist of A. RNA only. B. Protein only. C. RNA or DNA in a protein coat. D. RNA or DNA in a protein coat covered with lipid envelope. E. RNA, DNA and enzymes in a protein coat with a lipid envelope. - ANSWER C. RNA or DNA in a protein coat