BIOD 121: Module 4 Exam Portage Learning Questions and
Answers 2026
BIOD 121: Module 4 Carbohydrates Test Bank
1. What is the primary function of carbohydrates in the human body?
A. To provide structural support to bones
B. To act as the body's preferred source of energy (fuel)
C. To insulate organs against cold
D. To repair damaged muscle tissue
Answer: B
Rationale: While other nutrients can be used for energy, carbohydrates are the most
efficient fuel for the brain and muscles.
2. Which of the following is a "Monosaccharide"?
A. Sucrose
B. Lactose
C. Fructose
D. Starch
Answer: C
Rationale: Monosaccharides are single sugar units; the three main ones are Glucose,
Fructose, and Galactose.
3. "Blood Sugar" is the common name for which monosaccharide?
A. Fructose
B. Galactose
C. Glucose
D. Maltose
Answer: C
Rationale: Glucose is the specific sugar that circulates in the bloodstream to provide
energy to cells.
4. Which sugar is the sweetest and is found naturally in honey and fruits?
A. Glucose
B. Fructose
C. Sucrose
D. Lactose
,Answer: B
Rationale: Fructose (fruit sugar) is the sweetest of all the natural sugars.
5. A "Disaccharide" is formed by the chemical bonding of:
A. Two glucose molecules only
B. Two monosaccharides
C. One sugar and one protein
D. A chain of ten sugars
Answer: B
Rationale: Disaccharides are "double sugars" created when two single sugar units join
together.
6. "Table Sugar" is scientifically known as:
A. Lactose
B. Maltose
C. Sucrose
D. Amylose
Answer: C
Rationale: Sucrose is a disaccharide composed of one glucose and one fructose
molecule.
7. "Lactose" is the primary sugar found in:
A. Grains
B. Fruit
C. Milk and dairy products
D. Mushrooms
Answer: C
Rationale: Lactose (milk sugar) is made of glucose and galactose; it is found almost
exclusively in mammalian milk.
8. Which disaccharide is produced when starch is broken down during digestion
or fermentation?
A. Sucrose
B. Lactose
C. Maltose
D. Fructose
Answer: C
Rationale: Maltose (malt sugar) consists of two glucose molecules and is an
intermediate product of starch digestion.
, 9. "Polysaccharides" are also known as:
A. Simple sugars
B. Complex carbohydrates
C. Sugar alcohols
D. Artificial sweeteners
Answer: B
Rationale: Complex carbohydrates contain hundreds to thousands of glucose units
linked together.
10. What is the storage form of glucose in plants?
A. Glycogen
B. Fiber
C. Starch
D. Chitin
Answer: C
Rationale: Plants store excess glucose as starch (amylose and amylopectin), which
humans then eat for energy.
11. What is the storage form of glucose in humans and animals?
A. Starch
B. Glycogen
C. Cellulose
D. Glucagon
Answer: B
Rationale: Glycogen is stored in the liver and muscles to be quickly converted back into
glucose when blood sugar drops.
12. Which of the following carbohydrates cannot be digested by human
enzymes?
A. Amylose
B. Fiber (Cellulose)
C. Maltose
D. Glycogen
Answer: B
Rationale: Humans lack the enzymes to break the specific chemical bonds in fiber, so it
passes through the GI tract undigested.
13. "Soluble Fiber" is beneficial for heart health because it:
A. Speeds up digestion
B. Binds to cholesterol and prevents its absorption
Answers 2026
BIOD 121: Module 4 Carbohydrates Test Bank
1. What is the primary function of carbohydrates in the human body?
A. To provide structural support to bones
B. To act as the body's preferred source of energy (fuel)
C. To insulate organs against cold
D. To repair damaged muscle tissue
Answer: B
Rationale: While other nutrients can be used for energy, carbohydrates are the most
efficient fuel for the brain and muscles.
2. Which of the following is a "Monosaccharide"?
A. Sucrose
B. Lactose
C. Fructose
D. Starch
Answer: C
Rationale: Monosaccharides are single sugar units; the three main ones are Glucose,
Fructose, and Galactose.
3. "Blood Sugar" is the common name for which monosaccharide?
A. Fructose
B. Galactose
C. Glucose
D. Maltose
Answer: C
Rationale: Glucose is the specific sugar that circulates in the bloodstream to provide
energy to cells.
4. Which sugar is the sweetest and is found naturally in honey and fruits?
A. Glucose
B. Fructose
C. Sucrose
D. Lactose
,Answer: B
Rationale: Fructose (fruit sugar) is the sweetest of all the natural sugars.
5. A "Disaccharide" is formed by the chemical bonding of:
A. Two glucose molecules only
B. Two monosaccharides
C. One sugar and one protein
D. A chain of ten sugars
Answer: B
Rationale: Disaccharides are "double sugars" created when two single sugar units join
together.
6. "Table Sugar" is scientifically known as:
A. Lactose
B. Maltose
C. Sucrose
D. Amylose
Answer: C
Rationale: Sucrose is a disaccharide composed of one glucose and one fructose
molecule.
7. "Lactose" is the primary sugar found in:
A. Grains
B. Fruit
C. Milk and dairy products
D. Mushrooms
Answer: C
Rationale: Lactose (milk sugar) is made of glucose and galactose; it is found almost
exclusively in mammalian milk.
8. Which disaccharide is produced when starch is broken down during digestion
or fermentation?
A. Sucrose
B. Lactose
C. Maltose
D. Fructose
Answer: C
Rationale: Maltose (malt sugar) consists of two glucose molecules and is an
intermediate product of starch digestion.
, 9. "Polysaccharides" are also known as:
A. Simple sugars
B. Complex carbohydrates
C. Sugar alcohols
D. Artificial sweeteners
Answer: B
Rationale: Complex carbohydrates contain hundreds to thousands of glucose units
linked together.
10. What is the storage form of glucose in plants?
A. Glycogen
B. Fiber
C. Starch
D. Chitin
Answer: C
Rationale: Plants store excess glucose as starch (amylose and amylopectin), which
humans then eat for energy.
11. What is the storage form of glucose in humans and animals?
A. Starch
B. Glycogen
C. Cellulose
D. Glucagon
Answer: B
Rationale: Glycogen is stored in the liver and muscles to be quickly converted back into
glucose when blood sugar drops.
12. Which of the following carbohydrates cannot be digested by human
enzymes?
A. Amylose
B. Fiber (Cellulose)
C. Maltose
D. Glycogen
Answer: B
Rationale: Humans lack the enzymes to break the specific chemical bonds in fiber, so it
passes through the GI tract undigested.
13. "Soluble Fiber" is beneficial for heart health because it:
A. Speeds up digestion
B. Binds to cholesterol and prevents its absorption
