NDFS 100 – BYU ACTUAL EXAM #2 | NUTRITION, DIGESTION &
METABOLISM (2026 UPDATED EDITION) VERIFIED PRACTICE
EXAM MOST TESTED IN REAL EXAM | GRADED A+ STUDY
VERSION | PDF
1. Which of the following best describes the function of
enzymes in digestion?
A) They speed up chemical reactions that break down food.
Rationale: Enzymes act as biological catalysts, allowing
nutrients to be broken down into absorbable forms efficiently.
2. What is the main site of nutrient absorption in the body?
B) Small intestine
Rationale: Most macronutrient and micronutrient absorption
occurs in the small intestine due to its large surface area.
3. The primary role of carbohydrates in the diet is to:
A) Provide energy for the body.
Rationale: Carbohydrates are the body’s main source of
glucose, fueling brain and muscle activity.
4. Which of the following hormones regulates blood glucose
levels by lowering high blood sugar?
C) Insulin
Rationale: Insulin facilitates glucose uptake into cells,
decreasing blood glucose concentration.
5. The storage form of glucose in animals and humans is called:
, B) Glycogen
Rationale: Glycogen is stored in the liver and muscles for quick
energy release when blood glucose drops.
6. Which nutrient has the highest energy yield per gram?
D) Fat
Rationale: Fat provides 9 kcal/g, while carbohydrates and
proteins provide only 4 kcal/g.
7. The process of converting glucose to energy in the presence
of oxygen is called:
A) Aerobic respiration
Rationale: This process produces ATP efficiently using oxygen to
metabolize glucose.
8. Which of the following is NOT a function of protein in the
body?
C) Primary energy storage
Rationale: Proteins are used for tissue repair, enzyme
production, and hormones— not for energy storage.
9. Which of the following is an essential amino acid?
B) Lysine
Rationale: Essential amino acids must be obtained from food
because the body cannot synthesize them.
10. The majority of fat digestion occurs in the:
D) Small intestine
METABOLISM (2026 UPDATED EDITION) VERIFIED PRACTICE
EXAM MOST TESTED IN REAL EXAM | GRADED A+ STUDY
VERSION | PDF
1. Which of the following best describes the function of
enzymes in digestion?
A) They speed up chemical reactions that break down food.
Rationale: Enzymes act as biological catalysts, allowing
nutrients to be broken down into absorbable forms efficiently.
2. What is the main site of nutrient absorption in the body?
B) Small intestine
Rationale: Most macronutrient and micronutrient absorption
occurs in the small intestine due to its large surface area.
3. The primary role of carbohydrates in the diet is to:
A) Provide energy for the body.
Rationale: Carbohydrates are the body’s main source of
glucose, fueling brain and muscle activity.
4. Which of the following hormones regulates blood glucose
levels by lowering high blood sugar?
C) Insulin
Rationale: Insulin facilitates glucose uptake into cells,
decreasing blood glucose concentration.
5. The storage form of glucose in animals and humans is called:
, B) Glycogen
Rationale: Glycogen is stored in the liver and muscles for quick
energy release when blood glucose drops.
6. Which nutrient has the highest energy yield per gram?
D) Fat
Rationale: Fat provides 9 kcal/g, while carbohydrates and
proteins provide only 4 kcal/g.
7. The process of converting glucose to energy in the presence
of oxygen is called:
A) Aerobic respiration
Rationale: This process produces ATP efficiently using oxygen to
metabolize glucose.
8. Which of the following is NOT a function of protein in the
body?
C) Primary energy storage
Rationale: Proteins are used for tissue repair, enzyme
production, and hormones— not for energy storage.
9. Which of the following is an essential amino acid?
B) Lysine
Rationale: Essential amino acids must be obtained from food
because the body cannot synthesize them.
10. The majority of fat digestion occurs in the:
D) Small intestine
