Exam 13: Viruses, Viroids, and Prions

You are graduating from nursing school in three months and have already lined up a new job. However, your employer informs you that before you start your job, it is mandatory for you to be vaccinated against hepatitis B, a double-stranded DNA virus that can cause the disease hepatitis. Your boyfriend, a biology major, wonders why you need to get the vaccine. You aced your microbiology class and you know a lot about both viruses and vaccines, so you understand why getting this vaccination is essential. You give your boyfriend a mini lesson on this by answering a few of his questions. -To give more information on virus replication strategies, you explain to your friend the difference between a DNA virus and a RNA virus in terms of replication. You tell him that

Viruses are not cultivated in

An exit method used by viruses that does not immediately destroy the host bacterium is

The approximate viral concentration of a sample may be determined by

What part of the E. coli T4 phage attaches to the host cell receptors?

Transducing virulent phages do not lyse the cells they invade because

Which statement(s) about cells taken from a tumor is/are True?

The shape of the virus is determined by its

Which is True of lysogenized cells?

An antibiotic is added to a culture of E. coli, resulting in death of the cells. Bacteriophages are then added. Would the phages replicate in the E. coli cells? Why or why not?

There are ________ major families of DNA-containing viruses that infect vertebrates.

A lysogenic cell contains viral DNA (a prophage) integrated into the host chromosome.

Most temperate phages integrate into the host chromosome, whereas some replicate as plasmids. Which kind of relationship do you think would be more likely to maintain the phage in the host cell, and why?

Would ID₅₀ and LD₅₀ necessarily be the same for a given virus? Why or why not?

Prions affect the

A filamentous phage is incapable of causing a lytic infection.

The viral envelope closely resembles the

Which statement about most phages that contain single-stranded DNA is NOT True?

Completed filamentous phages are often found in the cytoplasm of infected bacteria.

Filamentous phages