Biology Homework Chapter 10: Viruses and Bacteria
Textbook assignment: Chapter 10: Molecular Biology of the Gene, sections 17-23.
- 10.17 This section introduces the anatomy, reproductive cycle, and function of the virus. Viruses are incomplete organisms that require the DNA or RNA of their host to reproduce. Note that this is different from the way a parasite, containing its own complete reproductive information, uses a host as a habitat.
- 10.18 Viruses can cause disease by reprogramming host cells to reproduce more viruses, diverting cell resources from functions critical to the health of the cell.
- 10.19 New viral diseases emerge when viruses mutate, jump species, or find their way into the general population from a previously isolated host species.
- 10.20 Retroviruses viruses (such as AIDS) use an enzyme called reverse transcriptase to make DNA from RNA. This is "backwards" information flow, and disrupts the source information for the host organism.
- 10.21 RNA fragments or viroids, and protein fragments called prions can reproduce in host cells, creating degenerative nerve diseases or aberrant growth patterns.
- 10.22 Bacteria can gain new DNA segments through transformation (picking up a strand from the environment), transduction (injection of DNA from a previous host by a phage), and conjugation (direct swapping of DNA through sex pili with another bacteria). These forms of genetic material transfer are considered a type of asexual reproduction.
- 10.23 It is relatively easy to splice a DNA segment into the circular DNA strand of a bacteria (integrated F Factor), or transfer it as a separate circular strand (F Factor plasmid), where it can then be expressed by the bacteria's normal physiological processes.
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.
Perform the study activity below:
- Required: Complete the Mastery Exercise with a score of 85% or better.
- Optional: Test yourself with the textbook multiple choice questions and note any that you miss that still don't make sense. Bring questions to chat!
- Go to the Moodle and take the quiz for this chapter.
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.
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