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Chapter 10:17-23 DNA Structure - Viruses and Bacteria Phages.

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Biology Homework Chapter 10: Viruses and Bacteria


Reading Preparation

Textbook assignment: Chapter 10: Molecular Biology of the Gene, sections 17-23.

Study Notes

Web Lecture

Read the following weblecture before chat: DNA Structure and Gene Inheritance

Take notes on any questions you have, and be prepared to discuss the lecture in chat.

Study Activity

Perform the study activity below:

Launch the Virus Explorer at HHMI BioInteractive.

  • Observe the shapes and surface features of the viruses, then click on "show relative sizes" to note the variation in virus sizes. Which is the largest virus in this collection? Which is the smallest?
  • Use the Envelope classification to identify which viruses have envelops and which don't. Do all viruses with envelopes share other features (spikes, shape)?
  • Examine the hosts each virus infects. Are there any viruses unique to plants that don't attack animals? Are there viruses that attack mammals other than humans, but not humans? Are there viruses unique to humans? Are there viruses that only attack bacteria?
  • How does RNA differ among viruses?
  • Which viruses are transmitted by contact with a sick human or mammal? Which viruses can cross species (animal to human, plant to plant)?
  • For which viruses do we have a vaccine?
  • Follow up for any particular virus that interests you. Use the detail button (plus sign below name) to view a more detailed 3D model of the virus, as well as cross-section details and an outline of how the virus replicates. Read the description

Chapter Quiz

Lab Work

Read through the lab for this week; bring questions to chat on any aspect of the lab, whether you intend not perform it or not. If you decide to perform the lab, be sure to submit your report by the posted due date.