WGU D440 OBJECTIVE ASSESSMENT 2026/2027 | Health &
Wellness Through Nutritional Science | Complete Review
Guide | Verified Q&A | Pass Guaranteed - A+ Graded
Section 1: Nutritional Foundations (12 Questions)
Q1: Which of the following is classified as a conditionally essential amino acid, required
in greater amounts during periods of physiological stress or illness?
A. Leucine
B. Lysine
C. Glutamine [CORRECT]
D. Phenylalanine
Correct Answer: C
Rationale: Glutamine becomes conditionally essential during metabolic stress (trauma,
sepsis, burns) when endogenous synthesis cannot meet demands. It serves as a
primary fuel for enterocytes and immune cells. Leucine (A) and lysine (B) are essential
amino acids required regardless of physiological state. Phenylalanine (D) is essential
and a precursor to tyrosine, not conditionally essential.
Q2: According to the Acceptable Macronutrient Distribution Ranges (AMDR), what
percentage of total daily calories should come from carbohydrates for adults?
A. 20-35%
B. 45-65% [CORRECT]
C. 10-35%
D. 25-50%
,Correct Answer: B
Rationale: The AMDR established by the Food and Nutrition Board specifies 45-65% of
calories from carbohydrates to reduce chronic disease risk while providing adequate
glucose for neurological function. 20-35% (A) represents the AMDR for fats. 10-35% (C)
represents the AMDR for protein. 25-50% (D) is not an established AMDR range.
Q3: Which dietary reference intake (DRI) category represents the average daily nutrient
intake level estimated to meet the requirement of half the healthy individuals in a
particular life stage and gender group?
A. Recommended Dietary Allowance (RDA)
B. Adequate Intake (AI)
C. Estimated Average Requirement (EAR) [CORRECT]
D. Tolerable Upper Intake Level (UL)
Correct Answer: C
Rationale: The EAR represents the median requirement for a population group and is
used to assess nutrient adequacy of populations and establish the RDA (EAR + 2
standard deviations). The RDA (A) meets 97-98% of individuals. AI (B) is used when EAR
cannot be determined. UL (D) represents maximum intake unlikely to cause adverse
effects.
Q4: Which of the following is a characteristic of lipids that distinguishes them from
carbohydrates and proteins?
A. They contain nitrogen in their chemical structure
B. They are hydrophilic and water-soluble
C. They provide 9 kcal per gram [CORRECT]
D. They are composed of amino acid chains
,Correct Answer: C
Rationale: Lipids provide 9 kcal/g, compared to 4 kcal/g for carbohydrates and proteins,
due to their greater hydrogen content and reduced oxygen. They do not contain nitrogen
(A—that describes proteins). They are hydrophobic (B), not hydrophilic. Amino acid
chains (D) describe proteins, not lipids.
Q5: The process by which amino acids are broken down, with their amino groups
removed and converted to urea for excretion, is called:
A. Glycogenesis
B. Deamination [CORRECT]
C. Lipolysis
D. Beta-oxidation
Correct Answer: B
Rationale: Deamination occurs in the liver, removing amino groups to form ammonia
(converted to urea via urea cycle) while carbon skeletons enter energy metabolism or
gluconeogenesis. Glycogenesis (A) is glycogen synthesis. Lipolysis (C) is triglyceride
breakdown. Beta-oxidation (D) is fatty acid catabolism.
Q6: Which organization is responsible for establishing the Dietary Guidelines for
Americans, updated every 5 years?
A. Food and Drug Administration (FDA)
B. United States Department of Agriculture (USDA) and Department of Health and
Human Services (HHS) [CORRECT]
C. Academy of Nutrition and Dietetics
D. World Health Organization (WHO)
Correct Answer: B
, Rationale: The USDA and HHS jointly publish the Dietary Guidelines for Americans
based on the scientific report from the Dietary Guidelines Advisory Committee. FDA (A)
regulates food labeling and safety. Academy of Nutrition and Dietetics (C) is a
professional organization. WHO (D) provides global guidelines but not the specific U.S.
Dietary Guidelines.
Q7: Which of the following is classified as a simple carbohydrate?
A. Starch
B. Glycogen
C. Sucrose [CORRECT]
D. Cellulose
Correct Answer: C
Rationale: Sucrose (glucose + fructose) is a disaccharide, classified as a simple
carbohydrate. Starch (A) and glycogen (B) are complex polysaccharides. Cellulose (D) is
a structural polysaccharide (fiber) indigestible by humans.
Q8: The primary storage form of glucose in human muscle and liver tissue is:
A. Insulin
B. Glucagon
C. Glycogen [CORRECT]
D. Amylose
Correct Answer: C
Rationale: Glycogen is the branched polysaccharide storage form of glucose, with liver
stores (80-100g) maintaining blood glucose and muscle stores (300-400g) providing
local energy. Insulin (A) and glucagon (B) are hormones regulating glucose metabolism.
Amylose (D) is a plant starch component.
Wellness Through Nutritional Science | Complete Review
Guide | Verified Q&A | Pass Guaranteed - A+ Graded
Section 1: Nutritional Foundations (12 Questions)
Q1: Which of the following is classified as a conditionally essential amino acid, required
in greater amounts during periods of physiological stress or illness?
A. Leucine
B. Lysine
C. Glutamine [CORRECT]
D. Phenylalanine
Correct Answer: C
Rationale: Glutamine becomes conditionally essential during metabolic stress (trauma,
sepsis, burns) when endogenous synthesis cannot meet demands. It serves as a
primary fuel for enterocytes and immune cells. Leucine (A) and lysine (B) are essential
amino acids required regardless of physiological state. Phenylalanine (D) is essential
and a precursor to tyrosine, not conditionally essential.
Q2: According to the Acceptable Macronutrient Distribution Ranges (AMDR), what
percentage of total daily calories should come from carbohydrates for adults?
A. 20-35%
B. 45-65% [CORRECT]
C. 10-35%
D. 25-50%
,Correct Answer: B
Rationale: The AMDR established by the Food and Nutrition Board specifies 45-65% of
calories from carbohydrates to reduce chronic disease risk while providing adequate
glucose for neurological function. 20-35% (A) represents the AMDR for fats. 10-35% (C)
represents the AMDR for protein. 25-50% (D) is not an established AMDR range.
Q3: Which dietary reference intake (DRI) category represents the average daily nutrient
intake level estimated to meet the requirement of half the healthy individuals in a
particular life stage and gender group?
A. Recommended Dietary Allowance (RDA)
B. Adequate Intake (AI)
C. Estimated Average Requirement (EAR) [CORRECT]
D. Tolerable Upper Intake Level (UL)
Correct Answer: C
Rationale: The EAR represents the median requirement for a population group and is
used to assess nutrient adequacy of populations and establish the RDA (EAR + 2
standard deviations). The RDA (A) meets 97-98% of individuals. AI (B) is used when EAR
cannot be determined. UL (D) represents maximum intake unlikely to cause adverse
effects.
Q4: Which of the following is a characteristic of lipids that distinguishes them from
carbohydrates and proteins?
A. They contain nitrogen in their chemical structure
B. They are hydrophilic and water-soluble
C. They provide 9 kcal per gram [CORRECT]
D. They are composed of amino acid chains
,Correct Answer: C
Rationale: Lipids provide 9 kcal/g, compared to 4 kcal/g for carbohydrates and proteins,
due to their greater hydrogen content and reduced oxygen. They do not contain nitrogen
(A—that describes proteins). They are hydrophobic (B), not hydrophilic. Amino acid
chains (D) describe proteins, not lipids.
Q5: The process by which amino acids are broken down, with their amino groups
removed and converted to urea for excretion, is called:
A. Glycogenesis
B. Deamination [CORRECT]
C. Lipolysis
D. Beta-oxidation
Correct Answer: B
Rationale: Deamination occurs in the liver, removing amino groups to form ammonia
(converted to urea via urea cycle) while carbon skeletons enter energy metabolism or
gluconeogenesis. Glycogenesis (A) is glycogen synthesis. Lipolysis (C) is triglyceride
breakdown. Beta-oxidation (D) is fatty acid catabolism.
Q6: Which organization is responsible for establishing the Dietary Guidelines for
Americans, updated every 5 years?
A. Food and Drug Administration (FDA)
B. United States Department of Agriculture (USDA) and Department of Health and
Human Services (HHS) [CORRECT]
C. Academy of Nutrition and Dietetics
D. World Health Organization (WHO)
Correct Answer: B
, Rationale: The USDA and HHS jointly publish the Dietary Guidelines for Americans
based on the scientific report from the Dietary Guidelines Advisory Committee. FDA (A)
regulates food labeling and safety. Academy of Nutrition and Dietetics (C) is a
professional organization. WHO (D) provides global guidelines but not the specific U.S.
Dietary Guidelines.
Q7: Which of the following is classified as a simple carbohydrate?
A. Starch
B. Glycogen
C. Sucrose [CORRECT]
D. Cellulose
Correct Answer: C
Rationale: Sucrose (glucose + fructose) is a disaccharide, classified as a simple
carbohydrate. Starch (A) and glycogen (B) are complex polysaccharides. Cellulose (D) is
a structural polysaccharide (fiber) indigestible by humans.
Q8: The primary storage form of glucose in human muscle and liver tissue is:
A. Insulin
B. Glucagon
C. Glycogen [CORRECT]
D. Amylose
Correct Answer: C
Rationale: Glycogen is the branched polysaccharide storage form of glucose, with liver
stores (80-100g) maintaining blood glucose and muscle stores (300-400g) providing
local energy. Insulin (A) and glucagon (B) are hormones regulating glucose metabolism.
Amylose (D) is a plant starch component.
