BIOD 121 NUTRITION EXAM 2 – PRACTICE QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A | INSTANT DOWNLOAD PDF.
Core Domains
Digestion and Absorption of Macronutrients
Water-Soluble and Fat-Soluble Vitamins
Major and Trace Minerals
Energy Metabolism and Cellular Oxidation
Fluid and Electrolyte Balance
Antioxidant Function and Bone Health
Clinical Nutritional Deficiencies and Toxicities
Regulatory Standards for Dietary Supplements
Introduction
This comprehensive practice assessment is designed to evaluate mastery of intermediate
nutritional science concepts, focusing on the physiological processes of nutrient utilization and
the biochemical roles of micronutrients. The exam assesses a candidate’s ability to integrate
foundational theory with clinical application through a series of multiple-choice and scenario-
based inquiries. Knowledge areas include metabolic pathways, the functional roles of vitamins
and minerals, and the regulatory frameworks governing nutritional standards. Emphasis is placed
on real-world decision-making, requiring the application of critical thinking to identify deficiencies,
manage toxicities, and understand the systemic impact of nutritional choices on human health
and disease prevention.
Section One: Questions 1–100
1. Which of the following organs is the primary site for the absorption of most nutrients in the
gastrointestinal tract?
A. Stomach
B. Small intestine
,C. Large intestine
D. Pancreas
🟢 B. Small intestine
🔴 RATIONALE: The small intestine, specifically the jejunum and ileum, provides a massive
surface area through villi and microvilli, making it the primary site for nutrient absorption.
2. A patient presents with night blindness and keratinization of the skin. Which vitamin
deficiency is most likely responsible for these symptoms?
A. Vitamin C
B. Vitamin D
C. Vitamin A
D. Vitamin K
🟢 C. Vitamin A
🔴 RATIONALE: Vitamin A (retinol) is essential for the formation of rhodopsin in the retina and
for maintaining the integrity of epithelial tissues.
3. Which enzyme is responsible for the initial breakdown of starches in the oral cavity?
A. Lingual lipase
B. Salivary amylase
C. Pepsin
D. Trypsin
🟢 B. Salivary amylase
🔴 RATIONALE: Salivary amylase, also known as ptyalin, begins the chemical digestion of
complex carbohydrates into smaller polysaccharides and maltose.
4. Which of the following is a water-soluble vitamin that acts as a coenzyme in energy
metabolism?
A. Vitamin E
B. Vitamin K
C. Thiamin
,D. Vitamin A
🟢 C. Thiamin
🔴 RATIONALE: Thiamin (Vitamin B1) is a water-soluble vitamin that serves as a coenzyme in
the form of TPP for the decarboxylation of pyruvate.
5. Intrinsic factor is necessary for the absorption of which nutrient?
A. Iron
B. Vitamin B12
C. Calcium
D. Folate
🟢 B. Vitamin B12
🔴 RATIONALE: Intrinsic factor, secreted by the parietal cells of the stomach, must bind to
Vitamin B12 to allow for its absorption in the terminal ileum.
6. Which mineral is primarily found in the hemoglobin of red blood cells and aids in oxygen
transport?
A. Magnesium
B. Zinc
C. Iron
D. Copper
🟢 C. Iron
🔴 RATIONALE: Iron is a central component of the heme group in hemoglobin, allowing for the
reversible binding and transport of oxygen.
7. A clinical scenario involves an elderly patient with brittle bones and low bone mineral
density. A deficiency in which pair of nutrients is most likely?
A. Vitamin K and Sodium
B. Calcium and Vitamin D
C. Vitamin E and Magnesium
D. Phosphorus and Vitamin C
, 🟢 B. Calcium and Vitamin D
🔴 RATIONALE: Calcium is the structural matrix of bone, and Vitamin D is essential for the
intestinal absorption of calcium to maintain bone density.
8. Which hormone is released by the pancreas in response to low blood glucose levels to
stimulate glycogenolysis?
A. Insulin
B. Glucagon
C. Cortisol
D. Epinephrine
🟢 B. Glucagon
🔴 RATIONALE: Glucagon is secreted by the alpha cells of the pancreas to signal the liver to
break down glycogen into glucose when blood sugar is low.
9. What is the primary function of bile in the digestive process?
A. Protein denaturation
B. Carbohydrate fermentation
C. Emulsification of fats
D. Activation of pepsinogen
🟢 C. Emulsification of fats
🔴 RATIONALE: Bile salts act as detergents to break down large fat globules into smaller
micelles, increasing the surface area for lipase action.
10. Which B-vitamin is significantly involved in DNA synthesis and the prevention of neural
tube defects?
A. Riboflavin
B. Niacin
C. Folate
D. Biotin
🟢 C. Folate
(VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A | INSTANT DOWNLOAD PDF.
Core Domains
Digestion and Absorption of Macronutrients
Water-Soluble and Fat-Soluble Vitamins
Major and Trace Minerals
Energy Metabolism and Cellular Oxidation
Fluid and Electrolyte Balance
Antioxidant Function and Bone Health
Clinical Nutritional Deficiencies and Toxicities
Regulatory Standards for Dietary Supplements
Introduction
This comprehensive practice assessment is designed to evaluate mastery of intermediate
nutritional science concepts, focusing on the physiological processes of nutrient utilization and
the biochemical roles of micronutrients. The exam assesses a candidate’s ability to integrate
foundational theory with clinical application through a series of multiple-choice and scenario-
based inquiries. Knowledge areas include metabolic pathways, the functional roles of vitamins
and minerals, and the regulatory frameworks governing nutritional standards. Emphasis is placed
on real-world decision-making, requiring the application of critical thinking to identify deficiencies,
manage toxicities, and understand the systemic impact of nutritional choices on human health
and disease prevention.
Section One: Questions 1–100
1. Which of the following organs is the primary site for the absorption of most nutrients in the
gastrointestinal tract?
A. Stomach
B. Small intestine
,C. Large intestine
D. Pancreas
🟢 B. Small intestine
🔴 RATIONALE: The small intestine, specifically the jejunum and ileum, provides a massive
surface area through villi and microvilli, making it the primary site for nutrient absorption.
2. A patient presents with night blindness and keratinization of the skin. Which vitamin
deficiency is most likely responsible for these symptoms?
A. Vitamin C
B. Vitamin D
C. Vitamin A
D. Vitamin K
🟢 C. Vitamin A
🔴 RATIONALE: Vitamin A (retinol) is essential for the formation of rhodopsin in the retina and
for maintaining the integrity of epithelial tissues.
3. Which enzyme is responsible for the initial breakdown of starches in the oral cavity?
A. Lingual lipase
B. Salivary amylase
C. Pepsin
D. Trypsin
🟢 B. Salivary amylase
🔴 RATIONALE: Salivary amylase, also known as ptyalin, begins the chemical digestion of
complex carbohydrates into smaller polysaccharides and maltose.
4. Which of the following is a water-soluble vitamin that acts as a coenzyme in energy
metabolism?
A. Vitamin E
B. Vitamin K
C. Thiamin
,D. Vitamin A
🟢 C. Thiamin
🔴 RATIONALE: Thiamin (Vitamin B1) is a water-soluble vitamin that serves as a coenzyme in
the form of TPP for the decarboxylation of pyruvate.
5. Intrinsic factor is necessary for the absorption of which nutrient?
A. Iron
B. Vitamin B12
C. Calcium
D. Folate
🟢 B. Vitamin B12
🔴 RATIONALE: Intrinsic factor, secreted by the parietal cells of the stomach, must bind to
Vitamin B12 to allow for its absorption in the terminal ileum.
6. Which mineral is primarily found in the hemoglobin of red blood cells and aids in oxygen
transport?
A. Magnesium
B. Zinc
C. Iron
D. Copper
🟢 C. Iron
🔴 RATIONALE: Iron is a central component of the heme group in hemoglobin, allowing for the
reversible binding and transport of oxygen.
7. A clinical scenario involves an elderly patient with brittle bones and low bone mineral
density. A deficiency in which pair of nutrients is most likely?
A. Vitamin K and Sodium
B. Calcium and Vitamin D
C. Vitamin E and Magnesium
D. Phosphorus and Vitamin C
, 🟢 B. Calcium and Vitamin D
🔴 RATIONALE: Calcium is the structural matrix of bone, and Vitamin D is essential for the
intestinal absorption of calcium to maintain bone density.
8. Which hormone is released by the pancreas in response to low blood glucose levels to
stimulate glycogenolysis?
A. Insulin
B. Glucagon
C. Cortisol
D. Epinephrine
🟢 B. Glucagon
🔴 RATIONALE: Glucagon is secreted by the alpha cells of the pancreas to signal the liver to
break down glycogen into glucose when blood sugar is low.
9. What is the primary function of bile in the digestive process?
A. Protein denaturation
B. Carbohydrate fermentation
C. Emulsification of fats
D. Activation of pepsinogen
🟢 C. Emulsification of fats
🔴 RATIONALE: Bile salts act as detergents to break down large fat globules into smaller
micelles, increasing the surface area for lipase action.
10. Which B-vitamin is significantly involved in DNA synthesis and the prevention of neural
tube defects?
A. Riboflavin
B. Niacin
C. Folate
D. Biotin
🟢 C. Folate
