WGU D440 Health and Wellness Through Nutritional
Science Review Final Exam Actual Exam 2026/2027 |
Complete Exam-Style Questions with Detailed Rationales
| Pass Guaranteed – A+ Graded
================================================================================
SECTION 1: MACRONUTRIENTS – CARBOHYDRATES, PROTEINS, AND LIPIDS (12 Questions)
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Q1: A patient with type 2 diabetes is monitoring carbohydrate intake. Which carbohydrate
classification best describes glycogen?
A. A simple sugar found in fruits and honey
B. A complex carbohydrate composed of glucose units stored in liver and muscle [CORRECT]
C. A dietary fiber that promotes bowel regularity
D. A disaccharide composed of glucose and galactose
Correct Answer: B
Rationale: Correct because glycogen is the storage form of glucose in animals, primarily located in
the liver and skeletal muscle, and is classified as a complex carbohydrate (polysaccharide)
composed of branching glucose units. This matches the biochemical definition of glycogen as the
animal equivalent of starch.
Q2: A nutrition counselor is advising a client on fiber intake. Which statement accurately describes
the difference between soluble and insoluble fiber?
A. Soluble fiber increases stool bulk and speeds transit time; insoluble fiber dissolves in water to
form gels
B. Soluble fiber dissolves in water to form viscous gels and can lower blood cholesterol; insoluble
fiber increases fecal bulk and speeds intestinal transit [CORRECT]
C. Both types of fiber are completely digested by colonic bacteria and provide 4 kcal/g of energy
D. Insoluble fiber is only found in fruits and oats; soluble fiber is exclusively found in whole wheat
and vegetables
Correct Answer: B
Rationale: Correct because soluble fiber (pectins, gums, mucilages) dissolves in water forming gels
that can bind bile acids and lower LDL cholesterol, while insoluble fiber (cellulose, hemicellulose,
lignin) adds bulk to stool and accelerates transit through the colon. Guidelines recommend adequate
intake of both types for optimal gastrointestinal health.
Q3: A dietitian is teaching a patient about the glycemic index (GI). Which food would have the
highest glycemic index value?
A. Lentils
B. Whole grain bread
C. White rice
D. Glucose [CORRECT]
,Correct Answer: D
Rationale: Correct because glucose serves as the reference standard for glycemic index with a value
of 100, representing the fastest absorption and greatest blood glucose response. All other foods are
compared against this baseline, with refined carbohydrates like white rice having high GI but still
below pure glucose.
Q4: During a metabolic physiology lecture, the instructor explains hormonal regulation of blood
glucose. Which hormone is primarily responsible for lowering blood glucose levels by promoting
cellular glucose uptake?
A. Glucagon
B. Cortisol
C. Insulin [CORRECT]
D. Epinephrine
Correct Answer: C
Rationale: Correct because insulin, secreted by pancreatic beta cells in response to elevated blood
glucose, facilitates glucose uptake into muscle and adipose tissue via GLUT4 transporters and
promotes glycogen synthesis and storage. This is the primary anabolic hormone for glucose
homeostasis.
Q5: A patient asks about the Acceptable Macronutrient Distribution Range (AMDR) for
carbohydrates. According to the Dietary Guidelines for Americans, what percentage of total daily
calories should come from carbohydrates?
A. 10–15%
B. 20–35%
C. 45–65% [CORRECT]
D. 70–80%
Correct Answer: C
Rationale: Correct because the AMDR for carbohydrates is established at 45–65% of total daily
caloric intake, providing sufficient glucose for brain function and physical activity while allowing
flexibility for individual dietary patterns. This range ensures adequate fiber intake when complex
carbohydrates are emphasized.
Q6: A nutrition student is analyzing protein quality. Which factor determines whether a protein is
classified as "complete"?
A. The protein contains all nine essential amino acids in sufficient quantities to support human
protein synthesis [CORRECT]
B. The protein is derived exclusively from animal sources
C. The protein contains only branched-chain amino acids
D. The protein has a digestibility score above 90% regardless of amino acid content
Correct Answer: A
Rationale: Correct because complete proteins contain all nine essential amino acids (histidine,
isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, valine) in proportions
adequate to support growth and maintenance. Animal proteins and soy are typically complete, while
most plant proteins require complementary combining.
, Q7: A hospitalized patient is receiving enteral nutrition support. The dietitian is monitoring nitrogen
balance to assess protein adequacy. Which laboratory finding indicates positive nitrogen balance?
A. Urinary nitrogen excretion exceeds dietary nitrogen intake
B. Nitrogen intake equals nitrogen excretion
C. Nitrogen intake exceeds nitrogen excretion [CORRECT]
D. Serum albumin is below 3.5 g/dL
Correct Answer: C
Rationale: Correct because positive nitrogen balance occurs when nitrogen intake (from dietary
protein) exceeds nitrogen excretion (primarily urinary urea), indicating net protein synthesis. This
state is essential during growth, pregnancy, lactation, and recovery from illness or surgery.
Q8: A 70-year-old male patient weighs 80 kg. Using the RDA of 0.8 g protein per kg body weight, what
is his minimum daily protein requirement?
A. 48 g
B. 56 g
C. 64 g [CORRECT]
D. 80 g
Correct Answer: C
Rationale: Correct because 80 kg × 0.8 g/kg = 64 g protein per day. This calculation applies the
Recommended Dietary Allowance for adults, which is set to meet the needs of 97.5% of the healthy
population and represents the minimum requirement for nitrogen equilibrium in most adults.
Q9: A client is concerned about saturated fat intake. Which lipid component is characterized by
having no double bonds between carbon atoms in its fatty acid chains?
A. Monounsaturated fatty acid
B. Polyunsaturated fatty acid
C. Saturated fatty acid [CORRECT]
D. Trans fatty acid
Correct Answer: C
Rationale: Correct because saturated fatty acids contain only single carbon-carbon bonds with
hydrogen atoms saturating all available bonding sites, making them solid at room temperature.
Dietary Guidelines recommend limiting saturated fat to less than 10% of total calories to reduce
cardiovascular disease risk.
Q10: A patient with hyperlipidemia is learning about lipoprotein metabolism. Which lipoprotein is
responsible for transporting dietary triglycerides from the intestine to peripheral tissues?
A. Low-density lipoprotein (LDL)
B. High-density lipoprotein (HDL)
C. Chylomicron [CORRECT]
D. Very-low-density lipoprotein (VLDL)
Correct Answer: C
Rationale: Correct because chylomicrons are the largest and least dense lipoproteins, formed in
intestinal enterocytes to transport exogenous (dietary) triglycerides and cholesterol through the
Science Review Final Exam Actual Exam 2026/2027 |
Complete Exam-Style Questions with Detailed Rationales
| Pass Guaranteed – A+ Graded
================================================================================
SECTION 1: MACRONUTRIENTS – CARBOHYDRATES, PROTEINS, AND LIPIDS (12 Questions)
================================================================================
Q1: A patient with type 2 diabetes is monitoring carbohydrate intake. Which carbohydrate
classification best describes glycogen?
A. A simple sugar found in fruits and honey
B. A complex carbohydrate composed of glucose units stored in liver and muscle [CORRECT]
C. A dietary fiber that promotes bowel regularity
D. A disaccharide composed of glucose and galactose
Correct Answer: B
Rationale: Correct because glycogen is the storage form of glucose in animals, primarily located in
the liver and skeletal muscle, and is classified as a complex carbohydrate (polysaccharide)
composed of branching glucose units. This matches the biochemical definition of glycogen as the
animal equivalent of starch.
Q2: A nutrition counselor is advising a client on fiber intake. Which statement accurately describes
the difference between soluble and insoluble fiber?
A. Soluble fiber increases stool bulk and speeds transit time; insoluble fiber dissolves in water to
form gels
B. Soluble fiber dissolves in water to form viscous gels and can lower blood cholesterol; insoluble
fiber increases fecal bulk and speeds intestinal transit [CORRECT]
C. Both types of fiber are completely digested by colonic bacteria and provide 4 kcal/g of energy
D. Insoluble fiber is only found in fruits and oats; soluble fiber is exclusively found in whole wheat
and vegetables
Correct Answer: B
Rationale: Correct because soluble fiber (pectins, gums, mucilages) dissolves in water forming gels
that can bind bile acids and lower LDL cholesterol, while insoluble fiber (cellulose, hemicellulose,
lignin) adds bulk to stool and accelerates transit through the colon. Guidelines recommend adequate
intake of both types for optimal gastrointestinal health.
Q3: A dietitian is teaching a patient about the glycemic index (GI). Which food would have the
highest glycemic index value?
A. Lentils
B. Whole grain bread
C. White rice
D. Glucose [CORRECT]
,Correct Answer: D
Rationale: Correct because glucose serves as the reference standard for glycemic index with a value
of 100, representing the fastest absorption and greatest blood glucose response. All other foods are
compared against this baseline, with refined carbohydrates like white rice having high GI but still
below pure glucose.
Q4: During a metabolic physiology lecture, the instructor explains hormonal regulation of blood
glucose. Which hormone is primarily responsible for lowering blood glucose levels by promoting
cellular glucose uptake?
A. Glucagon
B. Cortisol
C. Insulin [CORRECT]
D. Epinephrine
Correct Answer: C
Rationale: Correct because insulin, secreted by pancreatic beta cells in response to elevated blood
glucose, facilitates glucose uptake into muscle and adipose tissue via GLUT4 transporters and
promotes glycogen synthesis and storage. This is the primary anabolic hormone for glucose
homeostasis.
Q5: A patient asks about the Acceptable Macronutrient Distribution Range (AMDR) for
carbohydrates. According to the Dietary Guidelines for Americans, what percentage of total daily
calories should come from carbohydrates?
A. 10–15%
B. 20–35%
C. 45–65% [CORRECT]
D. 70–80%
Correct Answer: C
Rationale: Correct because the AMDR for carbohydrates is established at 45–65% of total daily
caloric intake, providing sufficient glucose for brain function and physical activity while allowing
flexibility for individual dietary patterns. This range ensures adequate fiber intake when complex
carbohydrates are emphasized.
Q6: A nutrition student is analyzing protein quality. Which factor determines whether a protein is
classified as "complete"?
A. The protein contains all nine essential amino acids in sufficient quantities to support human
protein synthesis [CORRECT]
B. The protein is derived exclusively from animal sources
C. The protein contains only branched-chain amino acids
D. The protein has a digestibility score above 90% regardless of amino acid content
Correct Answer: A
Rationale: Correct because complete proteins contain all nine essential amino acids (histidine,
isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, valine) in proportions
adequate to support growth and maintenance. Animal proteins and soy are typically complete, while
most plant proteins require complementary combining.
, Q7: A hospitalized patient is receiving enteral nutrition support. The dietitian is monitoring nitrogen
balance to assess protein adequacy. Which laboratory finding indicates positive nitrogen balance?
A. Urinary nitrogen excretion exceeds dietary nitrogen intake
B. Nitrogen intake equals nitrogen excretion
C. Nitrogen intake exceeds nitrogen excretion [CORRECT]
D. Serum albumin is below 3.5 g/dL
Correct Answer: C
Rationale: Correct because positive nitrogen balance occurs when nitrogen intake (from dietary
protein) exceeds nitrogen excretion (primarily urinary urea), indicating net protein synthesis. This
state is essential during growth, pregnancy, lactation, and recovery from illness or surgery.
Q8: A 70-year-old male patient weighs 80 kg. Using the RDA of 0.8 g protein per kg body weight, what
is his minimum daily protein requirement?
A. 48 g
B. 56 g
C. 64 g [CORRECT]
D. 80 g
Correct Answer: C
Rationale: Correct because 80 kg × 0.8 g/kg = 64 g protein per day. This calculation applies the
Recommended Dietary Allowance for adults, which is set to meet the needs of 97.5% of the healthy
population and represents the minimum requirement for nitrogen equilibrium in most adults.
Q9: A client is concerned about saturated fat intake. Which lipid component is characterized by
having no double bonds between carbon atoms in its fatty acid chains?
A. Monounsaturated fatty acid
B. Polyunsaturated fatty acid
C. Saturated fatty acid [CORRECT]
D. Trans fatty acid
Correct Answer: C
Rationale: Correct because saturated fatty acids contain only single carbon-carbon bonds with
hydrogen atoms saturating all available bonding sites, making them solid at room temperature.
Dietary Guidelines recommend limiting saturated fat to less than 10% of total calories to reduce
cardiovascular disease risk.
Q10: A patient with hyperlipidemia is learning about lipoprotein metabolism. Which lipoprotein is
responsible for transporting dietary triglycerides from the intestine to peripheral tissues?
A. Low-density lipoprotein (LDL)
B. High-density lipoprotein (HDL)
C. Chylomicron [CORRECT]
D. Very-low-density lipoprotein (VLDL)
Correct Answer: C
Rationale: Correct because chylomicrons are the largest and least dense lipoproteins, formed in
intestinal enterocytes to transport exogenous (dietary) triglycerides and cholesterol through the
