natural science official clep study guide
Exam Questions and Answers (Latest
2026)
Which disease is NOT genetically inherited
(A) Tuberculosis
(B) Phenylketonuria
(C) Huntington disease
(D) Cystic fibrosis
(E) Tay-Sachs disease - Correct Answers ✅(A) Tuberculosis
Which disease can be controlled merely
through regulation of diet
(A) Tuberculosis
(B) Phenylketonuria
(C) Huntington disease
(D) Cystic fibrosis
(E) Tay-Sachs disease - Correct Answers ✅(B)
Phenylketonuria
As a direct result of photosynthesis, energy is
stored in molecules of which of the following?
(A) RNA
,natural science official clep study guide
Exam Questions and Answers (Latest
2026)
(B) DNA
(C) C6H12O6 (glucose)
(D) H2O
(E) CO2 - Correct Answers ✅(C) C6H12O6 (glucose)
A person whose gallbladder has been removed
has a decreased ability to store bile and therefore
to digest
(A) fats
(B) starches
(C) sugars
(D) proteins
(E) vitamins - Correct Answers ✅(A) fats
Hard water is undesirable and is often softened
because hard water
(A) is too viscous for regular uses
(B) contains trace amounts of toxic substances
(C) forms insoluble precipitates when boiled or when used
with soap
,natural science official clep study guide
Exam Questions and Answers (Latest
2026)
(D) cannot be used efficiently by the body due to dissolved
impurities
(E) evaporates more rapidly than soft water - Correct
Answers ✅(C) forms insoluble precipitates when boiled or
when used with soap
Which of the following adaptations is more
likely to be found in the leaves of desert plants
than in those of plants that grow in moist
regions?
(A) Stomata mostly on upper leaf surface
(B) A thin, transparent cuticle
(C) A smooth leaf surface free of hairs
(D) A thickened epidermis and cuticle
(E) A loosely packed mesophyll layer - Correct Answers
✅(D) A thickened epidermis and cuticle
The classification characteristics that define the
genus of an animal or a plant are usually more
general than those defining
(A) a class
, natural science official clep study guide
Exam Questions and Answers (Latest
2026)
(B) an order
(C) a species
(D) a family
(E) a phylum - Correct Answers ✅(C) a species
If all the xylem from a section of tree trunk
could be removed, which of the following
would most likely happen first?
(A) Food could not pass from the leaves to the roots.
(B) The roots would be unable to transfer any stored food to
the spring buds.
(C) The leaves would be unable to get any carbon dioxide.
(D) The roots would be unable to store food.
(E) The leaves would be unable to get sufficient water. -
Correct Answers ✅(E) The leaves would be unable to get
sufficient water.
Whereas the ultimate source of energy for most
organisms is sunlight, the immediate source is
(A) chemical
(B) electrical
Exam Questions and Answers (Latest
2026)
Which disease is NOT genetically inherited
(A) Tuberculosis
(B) Phenylketonuria
(C) Huntington disease
(D) Cystic fibrosis
(E) Tay-Sachs disease - Correct Answers ✅(A) Tuberculosis
Which disease can be controlled merely
through regulation of diet
(A) Tuberculosis
(B) Phenylketonuria
(C) Huntington disease
(D) Cystic fibrosis
(E) Tay-Sachs disease - Correct Answers ✅(B)
Phenylketonuria
As a direct result of photosynthesis, energy is
stored in molecules of which of the following?
(A) RNA
,natural science official clep study guide
Exam Questions and Answers (Latest
2026)
(B) DNA
(C) C6H12O6 (glucose)
(D) H2O
(E) CO2 - Correct Answers ✅(C) C6H12O6 (glucose)
A person whose gallbladder has been removed
has a decreased ability to store bile and therefore
to digest
(A) fats
(B) starches
(C) sugars
(D) proteins
(E) vitamins - Correct Answers ✅(A) fats
Hard water is undesirable and is often softened
because hard water
(A) is too viscous for regular uses
(B) contains trace amounts of toxic substances
(C) forms insoluble precipitates when boiled or when used
with soap
,natural science official clep study guide
Exam Questions and Answers (Latest
2026)
(D) cannot be used efficiently by the body due to dissolved
impurities
(E) evaporates more rapidly than soft water - Correct
Answers ✅(C) forms insoluble precipitates when boiled or
when used with soap
Which of the following adaptations is more
likely to be found in the leaves of desert plants
than in those of plants that grow in moist
regions?
(A) Stomata mostly on upper leaf surface
(B) A thin, transparent cuticle
(C) A smooth leaf surface free of hairs
(D) A thickened epidermis and cuticle
(E) A loosely packed mesophyll layer - Correct Answers
✅(D) A thickened epidermis and cuticle
The classification characteristics that define the
genus of an animal or a plant are usually more
general than those defining
(A) a class
, natural science official clep study guide
Exam Questions and Answers (Latest
2026)
(B) an order
(C) a species
(D) a family
(E) a phylum - Correct Answers ✅(C) a species
If all the xylem from a section of tree trunk
could be removed, which of the following
would most likely happen first?
(A) Food could not pass from the leaves to the roots.
(B) The roots would be unable to transfer any stored food to
the spring buds.
(C) The leaves would be unable to get any carbon dioxide.
(D) The roots would be unable to store food.
(E) The leaves would be unable to get sufficient water. -
Correct Answers ✅(E) The leaves would be unable to get
sufficient water.
Whereas the ultimate source of energy for most
organisms is sunlight, the immediate source is
(A) chemical
(B) electrical
