41) The nucleic acids carried by viruses usually consist of A) DNA B) either DNA or RNA C) RNA D) both DNA and RNA simultaneously 42) Which of the following is not true of viruses? A) Viruses are acellular. B) Viruses consist of one or more molecules of DNA ORNA 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. 43) 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 44) Glycoprotein spikes protruding from the outer surface of viral envelopes function as A) toxins B) factors that bind to host cells C) cell lysis factors D) factors needed for site specific recombination 45) Which of the following is/are NOT true about viral envelopes? A) The envelope proteins are virus specific. B) The envelope lipids and carbohydrates are derived from the host. C) They are typical lipid monolayers with embedded viral proteins. D) The envelope proteins are virus specific and the envelope lipids and carbohydrates are derived from the host.