Chapter 18 Study Test - CHAPTER 18 1) The simplest...

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CHAPTER 18 AP BIOLOGY 1) The simplest infectious biological systems are C) viroids 2) Which of the following is a true statement about viruses? A) Viruses are classified below the cellular level of biological organization. 3) A researcher lyses a cell that contains nucleic acid molecules and capsid units of tobacco mosaic virus (TMV). The cell contents are left in a covered test tube overnight. The next day this mixture is sprayed on tobacco plants. Which of the following would be expected to occur? C) The plants would develop the typical symptoms of TMV infection. 4) Which of the following is a characteristic of all viruses? A) a protein capsid B) nucleic acid genome 5) Viruses have some of the properties of living organisms. Which of the following is a characteristic of all organisms, but not of viruses? E) plasma membrane 6) The host range of a virus is determined by A) the structure of the viral capsid. C) proteins on the surface of the cell. 7) Viruses are referred to as obligate parasites because E) they use the host cell's nucleotides and enzymes to reproduce. 8) The phage DNA is not hydrolyzed with the host DNA because A) phage DNA contains an urecognizable form of cytosine. 9) Double-stranded viruses can reproduce the lytic cycle and the lysogenic cycle. Which of the following is characterstic of the lytic cycle? E) A large number of phages are released at a time. 10) Bacteriophage DNAs that have become integrated into the host cell chromosome are called C) prophages. 11) Virulent phages undergo a(n) __________ life cycle, whereas temperate phages are capable of undergoing a(n) __________ cycle. C) lytic; lysogenic 12) Viral envelopes are generally A) composed of a lipid bilayer. 13) What is the function of reverse transcriptase in retroviruses? E) uses viral RNA as a template for DNA synthesis 14) What is the function of the single-stranded RNA in certain animal viruses? A) It becomes an mRNA. C) It is used as a template for the synthesis of DNA.
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This note was uploaded on 03/24/2011 for the course BIO 101 taught by Professor Smith during the Spring '11 term at Universidad Católica Boliviana.

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Chapter 18 Study Test - CHAPTER 18 1) The simplest...

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