An arco book arco is a registered trademark of Thomson Learning, Inc., and is used herein under license by Peterson’s. About The Thomson Corporation and Peterson’s

(C) The bats can fly faster than birds can.
(D) The bats can hunt at night while the birds are asleep.
(E) The bats roost in areas usually avoided by birds.
The correct answer is (D).  Echolocation allows the bats to hunt insects at night while birds
are asleep. None of the other choices relate to echolocation.

---

Biology E/M Subject Test
251
ARCO
■ SAT II Subject Tests
w w w . p e t e r s o n s . c o m / a r c o
EXAMPLE:
A biologist viewing a cell under a microscope could tell that the cell was from a plant rather
than an animal if the cell had
(A) a cell membrane and a nucleus
(B) a cell wall and chloroplasts
(C) a contractile vacuole and mitochondria
(D) a cell membrane and cilia
(E) a nucleus and cilia
The correct answer is (B).  Only plant cells have a cell wall and chloroplasts.
EXAMPLE:
A leaf from a green-and-white variegated colleus that was placed in the sun for several hours was
treated in the following manner: 1) placed in hot alcohol until colorless, 2) placed in a clean Petri
dish and flooded with Lugol’s iodine, 3) washed in distilled water, and 4) spread out on clean
white paper. The same procedure was followed with the leaf from a green-and-white variegated
plant that was stored without light for 12 hours. The following chart shows the results:
Treatment
White Area of Leaf
Green Area of Leaf
without light
with light
without light
with light
alcohol
white
white
white
white
Lugol’s
brown
brown
brown
blue-black
water
no change
no change
no change
no change
EXAMPLE:
Which of the following statements best explains the observed results of the experiments?