ciprofloxacin, erythromycin, and acyclovir are used to treat microbial
infections.  Criprofloxacin inhibits DNA gyrase.  Eryhtomycin binds in
front of the A site on the 50S subunit of a ribosome.  Acyclovir is a
guanine analog.  A.  What steps in protein synthesis are inhibited by
each drug?   B.  Which drug is more effective against bacteria and
why.   C.  Which drug is more effective against viruses ans why?   D.
Which drugs will have effects on the hosts cells and why?   and E. 
Use the index to identify the disease for which acyclovir is used. 
Why is it more effective than erythromycin for treating this disease?