In vertebrates with a double-loop circulation as illustrated in figure 27–4, the loop that passes through the lungs is responsible for:

a. exchanging carbon dioxide for oxygen from the air.
b. exchanging oxygen for carbon dioxide from the air.
c. delivering oxygen-rich blood to the body.
d. delivering oxygen-poor blood to the heart.

answers are:

lysogenic     viral dna merges with host cell dna

lysogenic     no symptoms

lytic               viral dna takes over

lysogenic     virus does not destroy host cell

lytic               virus destroys host cell

lytic               induces symptoms of viral infection

lysogenic       cell reproduces and spreads provirus