IPC Reteach - Viruses

PART 1–Are viruses alive? – 1:20 min

  1. Give two example of diseases caused by viruses mentioned in the video. Hint: Look at the graph
  1. All living organisms are made up of ______. Individual cells are the ______form of life. Anything ______does not count as ______.
  2. Are viruses made of cells?

If not…..do viruses have organelles like cells?

  1. Are viruses smaller, larger, or same size as cells?
  2. What are the two basic structures of viruses?

  1. Look at the picture of the bacteriophage virus on the right.
  • What is another name for the HEAD (protein coat)? ______
  • What nucleic acid does the bacteriophage use to reproduce? ______
  1. What do all viruses require in order to reproduce?
  1. Do viruses metabolize (get energy from food)? __
  2. Can viruses grow and develop? ____
  3. If viruses are NOT made of cells. They cannot grow or develop. Viruses do NOT eat for energy. Viruses do NOT respond to stimuli like you do. Based on this information, are viruses living? ______

PART 2–LYTIC CYCLE – 1:14 min

  1. Viruses are very specific to what cells they infect. What cells does a bacteriophage infect only?
  1. STEP 1 - ______

Bacteriophage ______to a bacterial host cell by recognizing and locking into specific ______site on the surface of a host cell.

  1. STEP 2 – ______

The virus then ______its ______into the host cell. Inside the host cell, the viral DNA ______the ______cell’s DNA.

  1. STEP 3 - ______

The virus then ______the total ______activities of the host cell. By using the raw materials present in the cell, the viral DNA directs the production of new viral parts (new parts are made).

  1. STEP 4 – ______

Newly produced viral components are ______into complete new virus particles.

  1. STEP 5 – ______and ______

The host cell ______open and ______100 to 200 new virus particles. These new virus particles can begin another ______by ______nearby______.

PRACTICE QUESTIONS

  1. A scientist is investigating a specimen in a laboratory. She is attempting to determine whether it is a virus or not. Which of the following would allow her to conclude that it is not a virus?
  1. The specimen is extremely small
  2. The specimen has a protein coat
  3. The specimen contains DNA
  4. The specimen has organelles
  1. All of the following is true about viruses except -
  1. Viruses are pathogens (cause diseases)
  2. Viruses use host cell DNA to replicate
  3. Viruses use organelles called ribosomes to make proteins
  4. Viruses are parasites (use a host for reproduction)
  1. How are the cells and viruses similar?
  1. Both, cells and viruses have organelles
  2. Both, cells and viruses have cytoplasm
  3. Both, cells and viruses can metabolize
  4. Both, cells and viruses have genetic material
  1. NUMBER the steps (1-5) of the lytic cycle in the correct order:

a. ______b. ______c. ______d. ______

e. ______