VIRUSES lesson 5: How Viruses Enter Cells Quizellenj2022-06-02T15:24:14-04:00 Please sign up for the course before taking this quiz. 1. Can you remember which of these is a naked virus with no envelope?1 coronavirus influenza HIV polio 2. Some viruses can stick to red blood cells.1 True False 3. CD4 is found on T cells, which are important members of your immune system. Which virus attaches to CD4?1 Influenza A Polio Adenovirus HIV 4. Why are the proton pumps so important in these lessons?1 Because viruses need low pH to cause shape changes that will allow it to get out of the endosome. Because viruses use the protons as an energy source so they can move. Because they are needed for the clathrin coating to be formed around the endosome. Because they are needed for the virus to be able to attach to a binding site. 5. REVIEW: Which cycle is the one where the virus hides for a long time inside the host’s genome?1 lysogenic lytic 6. Which one of these could NOT be a type of influenza?1 H2N2 H12N3 H5N7 H1H3 7. Cells have identification tags.1 True False 8. Cell can’t communicate because they can’t talk.1 True False 9. Cell receptors where viruses bind were first discovered while Mrs. McHenry (the author) was a young adult.1 True False 10. Which of these is NOT a glycoprotein?1 the receptor on which sialic acid is found HA (hemagglutinin NA (neuraminidase) RNA 11. All viruses need to merge (fuse) with the host membrane.1 True False 12. Which is true of a motor protein?1 All of these. It pulls endosomes through the cell. It travels along microtubule "highways" made of protein "cables." It uses ATP energy to "walk" along the microtubule. It is made of amino acids. 13. Some enzymes act like scissors.1 True False 14. What does “clathrin coating” of an endosome do?1 It pulls the endosome along a microtubule, toward the nucleus. It acts like a scissor and cuts the endosome from the membrane. It acts like a scaffold, helping the endosome to form. It helps the virus to bind to the endosome membrane. 15. Which receptor does coronavirus attach to?1 CD155 CAR ACE2 CD4 VIRUSES lesson 4: Bacteriophages VIRUSES lesson 6: Inside a Cell Back to: VIRUSES lesson 5: How Viruses Enter Cells
