2 ap biology multiple choice help needed?

A component of the body?s second line of defense does not include

 
   cell-mediated apoptosis  
 an inflammatory response to recent injury
 phagocytes ingesting invading organisms
 anti-microbial activity due to lysozyme excreted in tears  
 
Viral infected cells sometimes secrete a substance called interferon, which diffuses to other cells and protects them against viral infection. Which is not a possible mechanism by which interferon works?

 
   stimulating host cell DNA to produce an antiviral protein
 initiating a chain of events which ultimately blocks viral protein synthesis at the host cell ribosomes
 producing a substance which protects the cell against many different kinds of invading viruses
 destroying the ribosomes of invading viruses
 
The disadvantage in heat exchange for adjacent fluids moving in the same direction is that

 
   transfer occurs unevenly if the fluids are not moving the same speed
 there is no way to disperse the accumulated heat
 eventually it becomes difficult to distingiush the fluids from each other
 once the gradient has disappeared, no further transfer can take place