BIOD 121 Module 4 Exam | Portage Learning Nutrition Test
Bank 2026 EXAM with Questions and Answers/Plus a Rationale
Updated 2026 A+/Instant Download PDF
EXAM COVERAGE
1. Macronutrient Metabolism: Energy Balance, Basal Metabolic Rate (BMR), and Thermic Effect
of Food (TEF)
2. Vitamins: Water-Soluble (B-Complex and C) Functions, Deficiencies, and Toxicities
3. Vitamins: Fat-Soluble (A, D, E, K) Storage, Transport, Deficiencies, and Clinical Implications
4. Major Minerals and Trace Elements: Electrolyte Balance, Bone Health, and Oxygen Transport
Mechanisms
5. Fluid and Electrolyte Regulation: Intracellular/Extracellular Compartments, Osmosis, and Renal
Homeostasis
6. Nutritional Assessment, Body Composition, Anthropometric Measurements, and Energy
Expenditure Formulas
7. Lifespan Nutrition: Maternal-Fetal Requirements, Infancy, Childhood, and Age-Related
Geriatric Nutritional Alterations
8. Clinical Nutrition and Disease States: Obesity, Eating Disorders, Cardiovascular Disease, and
Metabolic Syndrome
9. Food Safety, Pathogens, Biotechnology, Food Additives, and Global Food Security Regulations
1. A clinical dietitian evaluates a 45-year-old male client with a sedentary lifestyle who wants to
calculate his total daily energy expenditure (TDEE). The client's basal metabolic rate (BMR) is
determined to be 1,700 kcal/day. Which component represents the smallest variable category of
energy expenditure for this sedentary individual?
A. Basal Metabolic Rate (BMR)
, B. Thermic Effect of Food (TEF)
C. Physical Activity Energy Expenditure (PAEE)
D. Non-Exercise Activity Thermogenesis (NEAT)
CORRECT ANSWER : B
Rationale: The Thermic Effect of Food (TEF) accounts for roughly 5 to 10 percent of total daily
energy expenditure, making it the smallest predictable category compared to BMR (60 to 75
percent) and physical activity. Although PAEE varies widely, TEF remains the least variable and
lowest absolute contributor.
2. A patient presents with classic signs of peripheral neuropathy, ataxia, and ophthalmoplegia
following chronic alcohol abuse and severe malabsorption. Which water-soluble vitamin
deficiency is primarily responsible for this clinical presentation (Wernicke-Korsakoff
syndrome)?
A. Riboflavin (Vitamin B2)
B. Niacin (Vitamin B3)
C. Thiamin (Vitamin B1)
D. Cobalamin (Vitamin B12)
CORRECT ANSWER : C
Rationale: Thiamin (Vitamin B1) acts as a coenzyme in key carbohydrate metabolic pathways
(such as the pyruvate dehydrogenase complex). Chronic alcohol intake impairs thiamin
absorption and storage, precipitating Wernicke-Korsakoff syndrome characterized by
neurological deficits, ataxia, and ophthalmoplegia.
3. During a routine physical examination, a young child is noted to have delayed closure of the
fontanelles, bowing of the legs, and widened wrist joints. Laboratory tests indicate low serum
25-hydroxyvitamin D and elevated parathyroid hormone (PTH). What is the primary diagnosis
and underlying nutritional etiology?
A. Scurvy caused by ascorbic acid deficiency
B. Rickets caused by inadequate vitamin D and calcium mineralization of growing bone
C. Beriberi caused by thiamin deficiency
D. Pellagra caused by niacin deficiency
, CORRECT ANSWER : B
Rationale: Rickets occurs in children due to vitamin D deficiency, which impairs intestinal
calcium and phosphorus absorption, leading to defective mineralization of the bone matrix, bone
deformities, and widened growth plates.
4. A 60-year-old female presents with macrocytic, megaloblastic anemia, glossitis, and
neurological symptoms including symmetric paresthesias and proprioception loss. Serum tests
show normal folate levels but decreased serum cobalamin and positive intrinsic factor antibodies.
What mechanism explains her condition?
A. Dietary lack of leafy green vegetables
B. Autoimmune destruction of parietal cells leading to pernicious anemia and failure of
vitamin B12 ileal absorption
C. Excessive intake of synthetic ascorbic acid supplements
D. Accelerated renal excretion of water-soluble vitamins
CORRECT ANSWER : B
Rationale: Pernicious anemia is an autoimmune condition where antibodies attack gastric
parietal cells or intrinsic factor, preventing the terminal ileum from absorbing vitamin B12
(cobalamin), resulting in megaloblastic anemia and irreversible neurological degeneration.
5. A patient taking high-dose warfarin therapy for a deep vein thrombosis is advised by their
clinical dietitian to maintain consistent daily dietary intake of green leafy vegetables. Which fat-
soluble vitamin interacts directly with warfarin?
A. Vitamin A
B. Vitamin D
C. Vitamin E
D. Vitamin K
CORRECT ANSWER : D
Rationale: Vitamin K is an essential cofactor for the carboxylation of glutamic acid residues on
clotting factors II, VII, IX, and X. Warfarin functions as a vitamin K antagonist; sudden shifts in
dietary vitamin K intake can dangerously alter anticoagulant efficacy.
, 6. A pregnant client in her first trimester asks about the primary reason for supplementing with
folate prior to conception and during early gestation. What congenital anomaly is directly
prevented by adequate maternal folate status?
A. Congenital heart valve stenosis
B. Neural tube defects (such as spina bifida and anencephaly)
C. Phenylketonuria (PKU)
D. Cleft lip and palate
CORRECT ANSWER : B
Rationale: Folate plays a critical role in DNA synthesis and cell division. Adequate maternal
folate intake during the periconceptional period significantly reduces the incidence of neural
tube defects during early embryonic neural fold closure.
7. An adult client consumes an excessive megadose of a fat-soluble vitamin supplement over
several months, resulting in symptoms of increased intracranial pressure, bone pain, liver
damage, and skin desquamation. Which vitamin toxicity is occurring?
A. Vitamin C toxicity
B. Preformed Vitamin A (Retinol) toxicity
C. Vitamin E toxicity
D. Niacin toxicity
CORRECT ANSWER : B
Rationale: Preformed vitamin A (retinol) is stored in the liver and is teratogenic and toxic in
high chronic doses, causing hypervitaminosis A manifested by headaches, hepatotoxicity, bone
abnormalities, and skin peeling.
8. Which mineral serves as a vital structural component of hemoglobin and myoglobin, facilitating
oxygen transport throughout the human body?
A. Calcium
B. Potassium
C. Iron
D. Magnesium
Bank 2026 EXAM with Questions and Answers/Plus a Rationale
Updated 2026 A+/Instant Download PDF
EXAM COVERAGE
1. Macronutrient Metabolism: Energy Balance, Basal Metabolic Rate (BMR), and Thermic Effect
of Food (TEF)
2. Vitamins: Water-Soluble (B-Complex and C) Functions, Deficiencies, and Toxicities
3. Vitamins: Fat-Soluble (A, D, E, K) Storage, Transport, Deficiencies, and Clinical Implications
4. Major Minerals and Trace Elements: Electrolyte Balance, Bone Health, and Oxygen Transport
Mechanisms
5. Fluid and Electrolyte Regulation: Intracellular/Extracellular Compartments, Osmosis, and Renal
Homeostasis
6. Nutritional Assessment, Body Composition, Anthropometric Measurements, and Energy
Expenditure Formulas
7. Lifespan Nutrition: Maternal-Fetal Requirements, Infancy, Childhood, and Age-Related
Geriatric Nutritional Alterations
8. Clinical Nutrition and Disease States: Obesity, Eating Disorders, Cardiovascular Disease, and
Metabolic Syndrome
9. Food Safety, Pathogens, Biotechnology, Food Additives, and Global Food Security Regulations
1. A clinical dietitian evaluates a 45-year-old male client with a sedentary lifestyle who wants to
calculate his total daily energy expenditure (TDEE). The client's basal metabolic rate (BMR) is
determined to be 1,700 kcal/day. Which component represents the smallest variable category of
energy expenditure for this sedentary individual?
A. Basal Metabolic Rate (BMR)
, B. Thermic Effect of Food (TEF)
C. Physical Activity Energy Expenditure (PAEE)
D. Non-Exercise Activity Thermogenesis (NEAT)
CORRECT ANSWER : B
Rationale: The Thermic Effect of Food (TEF) accounts for roughly 5 to 10 percent of total daily
energy expenditure, making it the smallest predictable category compared to BMR (60 to 75
percent) and physical activity. Although PAEE varies widely, TEF remains the least variable and
lowest absolute contributor.
2. A patient presents with classic signs of peripheral neuropathy, ataxia, and ophthalmoplegia
following chronic alcohol abuse and severe malabsorption. Which water-soluble vitamin
deficiency is primarily responsible for this clinical presentation (Wernicke-Korsakoff
syndrome)?
A. Riboflavin (Vitamin B2)
B. Niacin (Vitamin B3)
C. Thiamin (Vitamin B1)
D. Cobalamin (Vitamin B12)
CORRECT ANSWER : C
Rationale: Thiamin (Vitamin B1) acts as a coenzyme in key carbohydrate metabolic pathways
(such as the pyruvate dehydrogenase complex). Chronic alcohol intake impairs thiamin
absorption and storage, precipitating Wernicke-Korsakoff syndrome characterized by
neurological deficits, ataxia, and ophthalmoplegia.
3. During a routine physical examination, a young child is noted to have delayed closure of the
fontanelles, bowing of the legs, and widened wrist joints. Laboratory tests indicate low serum
25-hydroxyvitamin D and elevated parathyroid hormone (PTH). What is the primary diagnosis
and underlying nutritional etiology?
A. Scurvy caused by ascorbic acid deficiency
B. Rickets caused by inadequate vitamin D and calcium mineralization of growing bone
C. Beriberi caused by thiamin deficiency
D. Pellagra caused by niacin deficiency
, CORRECT ANSWER : B
Rationale: Rickets occurs in children due to vitamin D deficiency, which impairs intestinal
calcium and phosphorus absorption, leading to defective mineralization of the bone matrix, bone
deformities, and widened growth plates.
4. A 60-year-old female presents with macrocytic, megaloblastic anemia, glossitis, and
neurological symptoms including symmetric paresthesias and proprioception loss. Serum tests
show normal folate levels but decreased serum cobalamin and positive intrinsic factor antibodies.
What mechanism explains her condition?
A. Dietary lack of leafy green vegetables
B. Autoimmune destruction of parietal cells leading to pernicious anemia and failure of
vitamin B12 ileal absorption
C. Excessive intake of synthetic ascorbic acid supplements
D. Accelerated renal excretion of water-soluble vitamins
CORRECT ANSWER : B
Rationale: Pernicious anemia is an autoimmune condition where antibodies attack gastric
parietal cells or intrinsic factor, preventing the terminal ileum from absorbing vitamin B12
(cobalamin), resulting in megaloblastic anemia and irreversible neurological degeneration.
5. A patient taking high-dose warfarin therapy for a deep vein thrombosis is advised by their
clinical dietitian to maintain consistent daily dietary intake of green leafy vegetables. Which fat-
soluble vitamin interacts directly with warfarin?
A. Vitamin A
B. Vitamin D
C. Vitamin E
D. Vitamin K
CORRECT ANSWER : D
Rationale: Vitamin K is an essential cofactor for the carboxylation of glutamic acid residues on
clotting factors II, VII, IX, and X. Warfarin functions as a vitamin K antagonist; sudden shifts in
dietary vitamin K intake can dangerously alter anticoagulant efficacy.
, 6. A pregnant client in her first trimester asks about the primary reason for supplementing with
folate prior to conception and during early gestation. What congenital anomaly is directly
prevented by adequate maternal folate status?
A. Congenital heart valve stenosis
B. Neural tube defects (such as spina bifida and anencephaly)
C. Phenylketonuria (PKU)
D. Cleft lip and palate
CORRECT ANSWER : B
Rationale: Folate plays a critical role in DNA synthesis and cell division. Adequate maternal
folate intake during the periconceptional period significantly reduces the incidence of neural
tube defects during early embryonic neural fold closure.
7. An adult client consumes an excessive megadose of a fat-soluble vitamin supplement over
several months, resulting in symptoms of increased intracranial pressure, bone pain, liver
damage, and skin desquamation. Which vitamin toxicity is occurring?
A. Vitamin C toxicity
B. Preformed Vitamin A (Retinol) toxicity
C. Vitamin E toxicity
D. Niacin toxicity
CORRECT ANSWER : B
Rationale: Preformed vitamin A (retinol) is stored in the liver and is teratogenic and toxic in
high chronic doses, causing hypervitaminosis A manifested by headaches, hepatotoxicity, bone
abnormalities, and skin peeling.
8. Which mineral serves as a vital structural component of hemoglobin and myoglobin, facilitating
oxygen transport throughout the human body?
A. Calcium
B. Potassium
C. Iron
D. Magnesium
