BIOL 121 | BIOL121 Final Exam: Nutrition Updated
and Latest Questions and Correct Answers with
Rationale - Portage Learning
1. A 45-year-old male presents with fatigue and pale skin. His dietary history shows low
intake of meat and leafy greens. Laboratory results confirm microcytic anemia. Which of the
following is the most likely nutritional deficiency?
A. Vitamin B12
B. Iron
C. Folate
D. Vitamin C
Correct Answer: B
Expert Explanation: The correct answer is B because iron deficiency is the leading cause
of microcytic anemia, characterized by small red blood cells. Iron is a crucial component of
hemoglobin, which allows red blood cells to carry oxygen throughout the body. While B12
and folate deficiencies cause anemia, they typically result in macrocytic or large-cell
anemia rather than microcytic. Vitamin C helps with iron absorption but its deficiency
primarily causes scurvy rather than microcytic anemia. Therefore, the patient’s symptoms
and dietary habits strongly point to an insufficient intake of dietary iron.
2. Which organ is primarily responsible for the production of bile, which aids in the
emulsification of fats during digestion?
A. Gallbladder
B. Pancreas
C. Liver
D. Small Intestine
Correct Answer: C
Expert Explanation: The liver is the organ responsible for synthesizing bile from
cholesterol to assist in lipid digestion. Bile is then transported to the gallbladder, where it is
stored and concentrated until needed by the digestive system. The pancreas produces
digestive enzymes and bicarbonate but does not produce bile itself. The small intestine is
the site where bile acts upon fats but it is not the production site. Understanding this
distinction is vital for diagnosing biliary and hepatic diseases in clinical settings.
3. During a state of prolonged fasting or starvation, the body begins to produce these
compounds from fatty acids to provide an alternative energy source for the brain.
A. Glucose
,B. Amino acids
C. Ketone bodies
D. Lactic acid
Correct Answer: C
Expert Explanation: Ketone bodies are produced by the liver through ketogenesis when
glucose availability is low. This metabolic adaptation ensures that the brain has a usable
energy source when carbohydrate stores are depleted. Glucose cannot be synthesized
directly from fatty acids in significant amounts in humans. Amino acids are typically used
for gluconeogenesis or protein synthesis rather than being the primary byproduct of fat
breakdown during starvation. Lactic acid is a product of anaerobic glycolysis rather than a
long-term starvation fuel.
4. A patient consumes 250 grams of carbohydrates, 100 grams of protein, and 80 grams of fat
in one day. What is the total caloric intake for this patient?
A. 2120 kcal
B. 1800 kcal
C. 2500 kcal
D. 1400 kcal
Correct Answer: A
Expert Explanation: To calculate total calories, one must multiply the grams of each
macronutrient by its physiological fuel value. Carbohydrates and proteins provide 4 kcal
per gram, while fats provide 9 kcal per gram. Multiplying 250g carbs by 4 gives 1000 kcal,
100g protein by 4 gives 400 kcal, and 80g fat by 9 gives 720 kcal. Adding these values
(1000 + 400 + 720) results in a total of 2120 kcal. This calculation is a fundamental skill for
assessing energy balance and managing patient weight.
5. Which vitamin requires ‘intrinsic factor’ for absorption in the ileum of the small intestine?
A. Vitamin B6
B. Vitamin K
C. Vitamin D
D. Vitamin B12
Correct Answer: D
Expert Explanation: Vitamin B12 absorption is a complex process requiring intrinsic
factor secreted by the parietal cells of the stomach. Without this protein, B12 cannot be
effectively absorbed in the terminal ileum, leading to pernicious anemia. Vitamin B6 is
water-soluble but does not require intrinsic factor for its absorption process. Vitamins D
, and K are fat-soluble vitamins that rely on micelle formation and bile for absorption rather
than specific binding proteins. This concept explains why patients with gastric bypass or
certain autoimmune conditions often require B12 injections.
6. A woman in her first trimester of pregnancy is advised to take a supplement to prevent
neural tube defects. Which nutrient is the doctor most likely recommending?
A. Calcium
B. Vitamin A
C. Folic Acid
D. Iron
Correct Answer: C
Expert Explanation: Folic acid is essential for DNA synthesis and the proper closure of the
neural tube during early embryonic development. Adequate intake before and during early
pregnancy significantly reduces the incidence of spina bifida and anencephaly. While
calcium and iron are important during pregnancy, they do not play a primary role in
preventing neural tube defects. Excessive Vitamin A can actually be teratogenic, meaning it
can cause birth defects if taken in high doses. Thus, folic acid supplementation is a standard
public health recommendation for all women of childbearing age.
7. Which of the following describes a ‘complete protein’ source?
A. Contains all 20 amino acids in equal amounts
B. Is derived only from plant-based sources
C. Contains all 9 essential amino acids in sufficient quantities
D. Is easily digestible and contains no saturated fats
Correct Answer: C
Expert Explanation: A complete protein provides all nine essential amino acids that the
human body cannot synthesize on its own. Animal products like meat, eggs, and dairy are
typical examples of complete proteins. Plant sources are often incomplete, though soy and
quinoa are notable exceptions that provide all essential amino acids. Option A is incorrect
because proteins do not need all 20 amino acids in equal amounts to be considered
complete. Option D describes healthy characteristics but does not define the completeness
of a protein’s amino acid profile.
8. In the process of digestion, where does the majority of nutrient absorption occur?
A. Stomach
B. Small Intestine
C. Large Intestine
and Latest Questions and Correct Answers with
Rationale - Portage Learning
1. A 45-year-old male presents with fatigue and pale skin. His dietary history shows low
intake of meat and leafy greens. Laboratory results confirm microcytic anemia. Which of the
following is the most likely nutritional deficiency?
A. Vitamin B12
B. Iron
C. Folate
D. Vitamin C
Correct Answer: B
Expert Explanation: The correct answer is B because iron deficiency is the leading cause
of microcytic anemia, characterized by small red blood cells. Iron is a crucial component of
hemoglobin, which allows red blood cells to carry oxygen throughout the body. While B12
and folate deficiencies cause anemia, they typically result in macrocytic or large-cell
anemia rather than microcytic. Vitamin C helps with iron absorption but its deficiency
primarily causes scurvy rather than microcytic anemia. Therefore, the patient’s symptoms
and dietary habits strongly point to an insufficient intake of dietary iron.
2. Which organ is primarily responsible for the production of bile, which aids in the
emulsification of fats during digestion?
A. Gallbladder
B. Pancreas
C. Liver
D. Small Intestine
Correct Answer: C
Expert Explanation: The liver is the organ responsible for synthesizing bile from
cholesterol to assist in lipid digestion. Bile is then transported to the gallbladder, where it is
stored and concentrated until needed by the digestive system. The pancreas produces
digestive enzymes and bicarbonate but does not produce bile itself. The small intestine is
the site where bile acts upon fats but it is not the production site. Understanding this
distinction is vital for diagnosing biliary and hepatic diseases in clinical settings.
3. During a state of prolonged fasting or starvation, the body begins to produce these
compounds from fatty acids to provide an alternative energy source for the brain.
A. Glucose
,B. Amino acids
C. Ketone bodies
D. Lactic acid
Correct Answer: C
Expert Explanation: Ketone bodies are produced by the liver through ketogenesis when
glucose availability is low. This metabolic adaptation ensures that the brain has a usable
energy source when carbohydrate stores are depleted. Glucose cannot be synthesized
directly from fatty acids in significant amounts in humans. Amino acids are typically used
for gluconeogenesis or protein synthesis rather than being the primary byproduct of fat
breakdown during starvation. Lactic acid is a product of anaerobic glycolysis rather than a
long-term starvation fuel.
4. A patient consumes 250 grams of carbohydrates, 100 grams of protein, and 80 grams of fat
in one day. What is the total caloric intake for this patient?
A. 2120 kcal
B. 1800 kcal
C. 2500 kcal
D. 1400 kcal
Correct Answer: A
Expert Explanation: To calculate total calories, one must multiply the grams of each
macronutrient by its physiological fuel value. Carbohydrates and proteins provide 4 kcal
per gram, while fats provide 9 kcal per gram. Multiplying 250g carbs by 4 gives 1000 kcal,
100g protein by 4 gives 400 kcal, and 80g fat by 9 gives 720 kcal. Adding these values
(1000 + 400 + 720) results in a total of 2120 kcal. This calculation is a fundamental skill for
assessing energy balance and managing patient weight.
5. Which vitamin requires ‘intrinsic factor’ for absorption in the ileum of the small intestine?
A. Vitamin B6
B. Vitamin K
C. Vitamin D
D. Vitamin B12
Correct Answer: D
Expert Explanation: Vitamin B12 absorption is a complex process requiring intrinsic
factor secreted by the parietal cells of the stomach. Without this protein, B12 cannot be
effectively absorbed in the terminal ileum, leading to pernicious anemia. Vitamin B6 is
water-soluble but does not require intrinsic factor for its absorption process. Vitamins D
, and K are fat-soluble vitamins that rely on micelle formation and bile for absorption rather
than specific binding proteins. This concept explains why patients with gastric bypass or
certain autoimmune conditions often require B12 injections.
6. A woman in her first trimester of pregnancy is advised to take a supplement to prevent
neural tube defects. Which nutrient is the doctor most likely recommending?
A. Calcium
B. Vitamin A
C. Folic Acid
D. Iron
Correct Answer: C
Expert Explanation: Folic acid is essential for DNA synthesis and the proper closure of the
neural tube during early embryonic development. Adequate intake before and during early
pregnancy significantly reduces the incidence of spina bifida and anencephaly. While
calcium and iron are important during pregnancy, they do not play a primary role in
preventing neural tube defects. Excessive Vitamin A can actually be teratogenic, meaning it
can cause birth defects if taken in high doses. Thus, folic acid supplementation is a standard
public health recommendation for all women of childbearing age.
7. Which of the following describes a ‘complete protein’ source?
A. Contains all 20 amino acids in equal amounts
B. Is derived only from plant-based sources
C. Contains all 9 essential amino acids in sufficient quantities
D. Is easily digestible and contains no saturated fats
Correct Answer: C
Expert Explanation: A complete protein provides all nine essential amino acids that the
human body cannot synthesize on its own. Animal products like meat, eggs, and dairy are
typical examples of complete proteins. Plant sources are often incomplete, though soy and
quinoa are notable exceptions that provide all essential amino acids. Option A is incorrect
because proteins do not need all 20 amino acids in equal amounts to be considered
complete. Option D describes healthy characteristics but does not define the completeness
of a protein’s amino acid profile.
8. In the process of digestion, where does the majority of nutrient absorption occur?
A. Stomach
B. Small Intestine
C. Large Intestine
