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