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25.  These are Gelatin tube media.  Describe the reactions in tubes A and B. Include how you can differentiate a false + reaction from a true + reaction.

24.  These are Phenylalanine media inoculated with 2 different organisms A and B.  Describe the reactions in Tubes A and B.  What reagent is responsible for the color in tube B.                           A                       B        

Virus host range is determined by virus ligand binding to a specific host cell receptor.

1.  According to the handout distributed and discussed in the class, there are 5 biochemical tests that can help you identify the genus of gram – organisms. Name 3 of the biochemical tests.

Which choice describes a difference between Hfr X F(-) and F(+) X F(-) conjugation?

Why can HIV be an oncovirus? (one sentence should suffice)

Which choice best lists all of the enzymes located at a DNA replication fork.

In which gene transfer method is the donor cell infected by a bacteriophage?

4.  A western blot was used on the same sample to confirm, and the test was found to be 99% specific.  What does that mean?

6.  Define the following: a).  Total magnification b).  Parfocal c).  BSL