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