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Topics Tested
Approximate Percentage of Test
Cellular and Molecular Biology
12
Ecology
12
Classical Genetics
10
Organismal Biology
30
Evolution and Diversity
11
Ecology/Evolution Section (Biology–E Test)
or
25
Molecular/Evolution Section (Biology–M Test)

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Lesson 9
250
w w w . p e t e r s o n s . c o m / a r c o
ARCO
■ SAT II Subject Tests
The following are samples of the types of questions you will encounter on your exam:
EXAMPLE:
Ribosomes’ function in a cell is controlled by the
(A) endoplasmic reticulum
(B) mitochondria
(C) golgi bodies
(D) ribosomal RNA
(E) gamete
The correct answer is (D). The RNA is the immediate determinant of the characteristic func-
tion of an organism.
EXAMPLE:
Which of the following are secretions of the pituitary gland?
I.
Somatotropic hormone
II. Pitocin
III. Adrenalin
(A) I only
(B) II only
(C) I and II only
(D) I and III only
(E) I, II, and III
The correct answer is (C). Adrenalin is secreted by the adrenal cortex.
EXAMPLE:
The nutrients that supply an animal with its main source of energy are
(A) proteins
(B) carbohydrates
(C) lipids
(D) nucleic acids
(E) peptides
The correct answer is (B).  Carbohydrates are the main source of energy for animals.
EXAMPLE:
How might echolocation enable insect-eating bats to avoid competing with birds for food?
(A) The bats can cover a greater territory than birds can.
(B) The bats can find more insects than birds can.