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 influenza coronavirus HIV polio 2. Which receptor does coronavirus attach to?1 CD4 ACE2 CAR CD155 3. Cell receptors where viruses bind were first discovered while Mrs. McHenry (the author) was a young adult.1 True False 4. CD4 is found on T cells, which are important members of your immune system. Which virus attaches to CD4?1 HIV Adenovirus Influenza A Polio 5. Why are the proton pumps so important in these lessons?1 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. Because viruses need low pH to cause shape changes that will allow it to get out of the endosome. 6. Some enzymes act like scissors.1 True False 7. Some viruses can stick to red blood cells.1 True False 8. Cell can’t communicate because they can’t talk.1 True False 9. 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. 10. Which one of these could NOT be a type of influenza?1 H1H3 H2N2 H5N7 H12N3 11. REVIEW: Which cycle is the one where the virus hides for a long time inside the host’s genome?1 lytic lysogenic 12. Which is true of a motor protein?1 It travels along microtubule "highways" made of protein "cables." It uses ATP energy to "walk" along the microtubule. All of these. It is made of amino acids. It pulls endosomes through the cell. 13. Which of these is NOT a glycoprotein?1 the receptor on which sialic acid is found HA (hemagglutinin NA (neuraminidase) RNA 14. Cells have identification tags.1 True False 15. All viruses need to merge (fuse) with the host membrane.1 True False VIRUSES lesson 4: Bacteriophages VIRUSES lesson 6: Inside a Cell Back to: VIRUSES lesson 5: How Viruses Enter Cells
