BISC 261 test 2 || A+ Graded Already.

Viruses have typical cellular structure like other living organisms. correct answers FALSE Viruses in the extracellular state possess few, if any, active enzymes. correct answers TRUE Which is not true of viruses? correct answers They infect animal and plant cells only. Which of the following is true of viruses in the extracellular phase? correct answers They behave as a macromolecular complex and are no more alive than are ribosomes. A complete virus particle is called a correct answers virion The nucleic acids carried by viruses usually consist of correct answers either DNA or RNA. Which of the following is not true of viruses? correct answers Viruses replicate by binary fission Viruses infecting protists, including algae, have never been detected. correct answers FALSE One way in which small viruses package more information into a very small genome is to use overlapping genes so that the same base sequence is read in more than one reading frame. correct answers TRUE Almost all known plant viruses are RNA viruses. correct answers TRUE Virus morphology does not include which of the following characteristics? correct answers host range __________ are glycoprotein spikes protruding from the outer surface of the viral envelope. correct answers peplomers Icosahedral viruses are constructed from ring- or knob-shaped units called __________. correct answers capsomers Viruses that are polyhedrons with 20 sides are said to have __________ symmetry. correct answers icosahedral 5. The most common capsid morphologies are icosahedral and helical. correct answers TRUE The largest of the viruses are similar in size to some small bacteria and are large enough to be seen with a light microscope. correct answers TRUE The presence or absence of an envelope is not useful in classifying viruses because any given virus may at one time have an envelope and at another time not have an envelope. correct answers FALSE