5. What is the symbol used for the universal set? A. O B. C.U
D. JX1
6. What is the complement of U?
A. U B.
C. {0}
D.{1}
7. Given P={apple, orange, banana, mango) and
Q={orange, mango, watermelon) and what is
PUR?
A. Ø
B. {apple, orange, banana}
C. {apple, orange, banana, mango}
D.{apple, orange, banana, mango, watermelon}
8. What is the symbol used for intersection?
A. U B. o
C. c
D. E
9. If set A={3,4,5,6) and set B={2,4,6,8), what is A-B?
A. B. {3}
C. {3,5) D. {4,6)
10. The set of all elements in the universal set that is
not in Set A is called
A. complement of a set.
B. difference of sets.
C. disjoint set
D. Venn Diagram
i

Which of the following best reflects what we know about how the flu virus moves between species? a) the flu virus in a pig is mutated and replicated in alternate arrangements so that humans who eat the pig products can be infected.b) a flu virus from a human epidemic or pandemic infects birds; the birds replicate the virus differently and then pass it back to humans.c) an influenza virus gains new sequences of dna from another virus, such as a herpesvirus; this enables it to be transmitted to a human host.d) an animal such as a pig is infected with more than one virus, genetic recombination occurs, the new virus mutates, the virus is passed to a new species such as a bird, and the virus mutates again and can now be transmitted to humans.