Viruses

  1. Characteristics of Viruses
  2. ______are not alive & are not cells. Viruses ARE ______particles that cause disease (Flu, HIV, colds, warts)
  3. Do not exhibit all criteria of ______such as growth and development.
  4. Once inside a host cell…they exhibit two characteristics of life
  5. They ______inside a host cell.
  6. ______& are able to mutate.
  7. Named after the diseases they cause or the tissues/organs they infect. ______–viruses that infect bacteria
  1. Structure of Viruses
  2. ______-outer protein coat
  3. Inner core- ______contains instructions for copying viruses.
  4. The tail and tail fibers help viruses bind to the host cell
  5. Envelope – ______coat with a structure similar to the plasma membrane. Only on some viruses.
  1. How do viruses attack?
  2. Viruses recognize and attach to a ______on a host. A virus latches onto a host cell with its “tails”.
  3. Viruses are species and ______. This prevents the spread of ______.
  4. Viruses just attack one particular kind of cell. (HepB & Liver Cell)
  5. Viruses inject their ______into the host cell.
  6. An enveloped virus is ______by the host cell then burst the vacuole to release nucleic acid into the host
  1. Lytic cycle
  2. Viruses take over the ______of the host cell.
  3. The host cell’s ______, ______, ______are used to ______viral genes and new virus particles are produced.
  4. The new virus particles ______of the host cell and then ______
  5. 5 step Process

1.

2.

3.

4.

5.

  1. Lysogenic Cycle
  2. Replication cycle in which the ______acid becomes part of the host cell’s ______.
  3. Viral DNA that is integrated into the host cell’s chromosomes is called a ______.
  4. The host cell will continue its activities. (______)
  5. Virus replicates ______.
  6. Lysogenic cycle can continue for _____until the provirus/temperate virus is activated and enters a ______
  7. Examples: HIV; HepB; Shingles

VI.  Viruses exit host cell and infect other cells.

a.  ______-viruses burst from cell killing the cell in the process

b.  ______-secreted from cell by active transport

  1. Retrovirus
  2. Virus that contains the ______rather than the more common______
  3. Viral RNA is converted into DNA by ______.
  4. When a retrovirus infects a cell, it injects its RNA into the cytoplasm of that cell along with the ______
  5. Retroviruses then become ______
  6. HIV (lysogenic stage) Affects ______WBC’s fight ______; decrease in WBC’s leads to the inability to resist disease.
  7. People do not appear sick and pass to others. Transmitted through ______, & from mother to baby
  8. ______when cells enter ______and WBCs are killed
  1. Tumor viruses (RETROVIRUS)
  2. Cause normal cells to become tumorous
  3. Cancers caused by viruses
  4. Human Papilloma Virus – ______
  5. Hepatitis B virus-______

  1. Diseases caused by viruses

  1. ______-common cold
  2. Herpes zoster virus______
  3. ______-polio (paralysis)
  4. ____/AIDS
  5. ______
  6. Mumps
  7. Hepatitis