Why is the blood-testis barrier important? a. because some blood contents are toxic to the spermatozoa b. because immature sperm cells lose their motility when they encounter any blood component c. because spermatozoa and developing cells produce surface antigens that are recognized as foreign by the immune system d. actually, the blood-testis barrier has no function?

kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above

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