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