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