Biology II Chapter 19 - 2

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Yasham
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84454
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Biology II Chapter 19 - 2
Updated:
2011-10-06 18:39:09
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Biology Viruses Campbell
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Chapter 19 of Campbell's Biology Textbook 8th - Viruses (Retroviruses)
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  1. What is occuring in step 1 in the reproductive cycle of the retrovirus HIV?
    The envelope glycoproteins enable the cirus to bind to specific receptors on certain white blood cells.
  2. What is occuring in step 2 in the reproductive cycle of the retrovirus HIV?
    The virus fuses with the cell's plama membrane. The capsid proteins are removed, releasing the viral proteins and RNA.
  3. What is occuring in step 3 in the reproductive cycle of the retrovirus HIV?
    Reverse transcriptase catalyzes the synthesis of a DNA strand completementary to the viral RNA.
  4. What is occuring in step 4 in the reproductive cycle of the retrovirus HIV?
    Reverse transcriptase catalyzes the synthesis of a second DNA strand complementary to the first.
  5. What is occuring in step 5 in the reproductive cycle of the retrovirus HIV?
    The double-stranged DNA is incorporated as a provius into the cell's DNA.
  6. What is occuring in step 6 in the reproductive cycle of the retrovirus HIV?
    Proviral genes are transcribed into RNA molecules, which serve as genomes for the next viral generation and as mRNAs for translation into viral protein.
  7. What is occuring in step 7 in the reproductive cycle of the retrovirus HIV?
    The viral proteins include capsid proteins and reverse transcriptase (made in the cytosol) and envelope glycoproteins (made in the ER).
  8. What is occuring in step 8 in the reproductive cycle of the retrovirus HIV?
    Vesicles transport the glycoproteins to the cell's plasma membrane.
  9. What is occuring in step 9 in the reproductive cycle of the retrovirus HIV?
    Capsids are assembled around viral genomes and reverse transcriptase molecules.
  10. What is occuring in step 10 in the reproductive cycle of the retrovirus HIV?
    New viruses bud off from the host cell.
  11. Contrast a provirus to a prophage.
    A provirus is an integrated viral DNA that never leaves the host's genome. It remains a permanent resident of the cell.

    A prophage leaves the host's genome at the start of lytic cycle.

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