Day 54, pages 328 to 331

Read this article about COVI-19 proteins. 

TMV (5)

viruses (9)

virus development (10)

Quiz, pp. 328 to 331

1.  Read pp. 328 -- 329, "Researchers discovered viruses by studying a plant disease."

How did scientists decide TMV was contagious, and how did they know there were very small pathogens involved?

2.  Viruses are not c____;  they are i____________ particles consisting of n________ acid enclosed in a p__________ coat and, in some cases, a m________________ envelope.

3.  What are the two major genetic categories of viruses?

4.  What is the protein shell that encloses a virus's genome called?

5.  What are viruses that attack bacteria called?

6.  Sketch the four types of viruses showcased on page 330, figure 18.2;  label each one.

7.  Name some things a cell (like a bacteria cell) can do that a virus can't.

8.  Name some structures that a cell (like a bacteria cell) has that a virus doesn't.

9.  Viruses can only r_________________ within a  h_________ cell.

10.  The proteins on the outside of a virus are like a key that has to fit into the lock on the surface of a host cell;  what feature of viral infection does this result in?

11.  Within a host animal a virus usually can only infect a specific type of t____________ (s).  This is why different viral infections result in different s____________.

12.  If you take tobacco mosaic viruses and separate the RNA guts from the outer casing, then you mix the bits back up again, what will happen?