This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
All of the following are general propeies of Viruses except - 
Select and explain. 
A. May contain both DNA and RNA, B. Form extracellular infectious paicles, C. Heat labile, D. Not affected by antibiotics
A: May contain both DNA and RNA
Answer: A: May contain both DNA and RNA 
Explanation: Ans. is 'a' i.e., May contain both DNA and RNA Propeies of viruses . Viruses are obligate intracellular parasites . They lack enzymes necessary for protein and nucleic acid synthesis and are dependent for replication on the synthetic machinery of host cells -4 so, they cannot grow in cell free culture media. . They do not have cellular organization. . They are unaffected by antibacterial antibiotics. . They contain only one type of nucleic acid, either RNA or DNA, never both. . They multiply by a complex process and not by binary fission. . The extracellular infections virus paicle is called the virion. . With few exceptions, viruses are very heat labile.