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(D) One year after the population of prey in-
creases, there is a parallel rise in the
population of predator.
(E) No correlation between predator and
prey populations is observed.
43. According to the Hardy-Weinberg law, genetic
equilibrium within a gene pool is contingent
upon several factors. Which of the following
is one of the requirements?
(A) Population size must be small.
(B) Genetic drift occurs.
(C) There is an absence of gene flow.
(D) Mutations are frequent and not balanced.
(E) There is an absence of random repro-
duction.

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Biology E/M Subject Test
259
ARCO
■ SAT II Subject Tests
w w w . p e t e r s o n s . c o m / a r c o
46. The diagram below illustrates the growth curve
of a certain bacteria in a controlled environ-
ment. Which time period represents the maxi-
mal growth acceleration of the bacterial popu-
lation?
(A) Between hours 2 and 4
(B) Between hours 4 and 6
(C) Between hours 6 and 8
(D) Between hours 8 and 10
(E) Between hours 10 and 12
47. In the early stages of certain diseases, pooled
immunoglobulin may be administered. Often,
the disease process will be significantly less
severe as a result of this treatment. The pooled
immunoglobulin contains antibodies that are
specific for the infectious agent. This treatment
is an example of
(A) active immunity
(B) passive immunity
(C) colostrum
(D) vaccination
(E) autoimmunity
48. Which of the following is derived from the
ectodermal germ layer?
(A) Mammary glands
(B) Thyroid gland