a. An antigen is any substance that triggers an
immune response.
b. The basic function of the immune system is to
distinguish between self and nonself.
c. One of the immune system’s primary
functions is the allergic response.
d. The human body presents an opportune
habitat for microbes.
49. Why would tissue transplanted from father to
daughter have a greater risk of being detected as
foreign than a tissue transplanted between
identical twins?
a. The age of the twins’ tissue would be the same
and therefore less likely to be rejected.
b. The identical twin’s tissue would carry the
same self-markers and would therefore be less
likely to be rejected.
c. The difference in the sex of the father and
daughter would cause the tissue to be rejected
by the daughter’s immune system.
d. The twins’ immune systems would “remem-
ber” the same encounters with childhood
illnesses.
50. What is the meaning of the underlined word
intricacies as it is used in the first sentence of the
passage?
a. elaborate interconnections
b. confusion of pathways
c. inherent perplexity
d. comprehensive coverage
– P O S T T E S T – 1 6 6
A n s w e r K e y – P O S T T E S T – 1 6 7 1. c. Lesson 3
2. b. Lesson 1
3. b. Lesson 18
4. c. Lesson 2
5. a. Lesson 8
6. c. Lesson 14
