MDCII NUTRITION FINAL EXAM STUDYGUIDE 2025 ACTUAL EXAM
COMPLETE QUESTIONS WITH DETAILED VERIFIED ANSWERS
(100% CORRECT ANSWERS) ALREADY GRADED A+
Question 1
Which of the following macronutrients is the body's primary and most preferred source of
energy, especially for the brain and red blood cells?
A) Proteins
B) Fats
C) Vitamins
D) Carbohydrates
E) Minerals
Correct Answer: D) Carbohydrates
Rationale: Carbohydrates are the body's primary and most readily available source of
energy, providing glucose that is essential for the function of the brain, central nervous
system, and red blood cells. While fats and proteins can also provide energy, carbohydrates
are preferred and more efficiently utilized.
Question 2
What is the recommended Acceptable Macronutrient Distribution Range (AMDR) for
carbohydrates for adults?
A) 10-20% of total daily calories
B) 20-35% of total daily calories
C) 45-65% of total daily calories
D) 65-75% of total daily calories
E) Less than 10% of total daily calories
Correct Answer: C) 45-65% of total daily calories
Rationale: The Acceptable Macronutrient Distribution Range (AMDR) for carbohydrates in
adults is 45-65% of total daily calories. This range is associated with a reduced risk of
chronic disease while providing adequate intake of essential nutrients.
Question 3
Which monosaccharide is commonly known as "fruit sugar" and is found naturally in fruits,
honey, and some vegetables?
A) Glucose
B) Galactose
C) Sucrose
D) Fructose
E) Lactose
Correct Answer: D) Fructose
Rationale: Fructose is a monosaccharide often referred to as "fruit sugar" due to its
abundance in fruits. It is also a component of sucrose (table sugar) and is found in honey.
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Question 4
Lactose, the sugar found in milk, is a disaccharide composed of which two monosaccharides?
A) Glucose and Fructose
B) Glucose and Galactose
C) Fructose and Galactose
D) Glucose and Sucrose
E) Maltose and Glucose
Correct Answer: B) Glucose and Galactose
Rationale: Lactose is a disaccharide (a sugar made of two monosaccharide units) formed by
the chemical bonding of glucose and galactose. It is the primary carbohydrate found in
milk and dairy products.
Question 5
Which type of fiber is known for its ability to lower blood cholesterol and glucose levels, and is
found in oats, barley, nuts, seeds, and some fruits and vegetables?
A) Insoluble fiber
B) Soluble fiber
C) Cellulose
D) Lignin
E) Hemicellulose
Correct Answer: B) Soluble fiber
Rationale: Soluble fiber dissolves in water to form a gel-like material. It is known to help
lower blood cholesterol by binding to bile acids and reducing glucose absorption, thereby
helping to control blood sugar levels. Good sources include oats, barley, legumes, apples,
and citrus fruits.
Question 6
What is the primary function of glycogen in the human body?
A) To build and repair tissues.
B) To insulate organs and provide structural support.
C) To serve as the storage form of glucose in the liver and muscles.
D) To transport fats through the bloodstream.
E) To regulate fluid balance.
Correct Answer: C) To serve as the storage form of glucose in the liver and muscles.
Rationale: Glycogen is the highly branched polysaccharide that serves as the primary
storage form of glucose in animals. It is synthesized and stored predominantly in the liver
and muscles, acting as an readily available energy reserve.
Question 7
The complete digestion of carbohydrates primarily occurs in which part of the digestive tract?
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A) Stomach
B) Large intestine
C) Small intestine
D) Esophagus
E) Oral cavity
Correct Answer: C) Small intestine
Rationale: While carbohydrate digestion begins in the mouth with salivary amylase and
briefly continues in the stomach, the majority of carbohydrate digestion, particularly the
breakdown of disaccharides and complex carbohydrates into monosaccharides, occurs in
the small intestine through the action of pancreatic amylase and disaccharidases (lactase,
sucrase, maltase).
Question 8
Which of the following is a potential health benefit of consuming a diet rich in whole grains?
A) Increased risk of type 2 diabetes.
B) Increased risk of cardiovascular disease.
C) Reduced risk of constipation and colon cancer.
D) Decreased satiety and increased appetite.
E) Lower intake of essential vitamins and minerals.
Correct Answer: C) Reduced risk of constipation and colon cancer.
Rationale: Whole grains are rich in dietary fiber. Insoluble fiber adds bulk to stool,
promoting regularity and reducing the risk of constipation and diverticular disease, and
potentially colon cancer. Soluble fiber can help lower cholesterol and blood glucose. Whole
grains also provide essential vitamins and minerals.
Question 9
What is the recommended Adequate Intake (AI) for fiber for adult women?
A) 10 grams per day
B) 15 grams per day
C) 25 grams per day
D) 38 grams per day
E) 50 grams per day
Correct Answer: C) 25 grams per day
Rationale: The Adequate Intake (AI) for fiber for adult women is generally 25 grams per
day. For adult men, it is 38 grams per day.
Question 10
Which of the following accurately describes the role of protein in the body?
A) Primary source of immediate energy.
B) Main component of cell membranes, providing flexibility.
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C) Essential for building and repairing tissues, enzymes, and hormones.
D) Primarily responsible for insulation and shock absorption.
E) Solely functions as a genetic blueprint.
Correct Answer: C) Essential for building and repairing tissues, enzymes, and hormones.
Rationale: Proteins are fundamental to life, playing crucial roles in building and repairing
tissues, synthesizing enzymes (which catalyze biochemical reactions), hormones (which
regulate physiological processes), and other body compounds. They also contribute to
immune function, fluid balance, and acid-base balance.
Question 11
What is an "essential amino acid"?
A) An amino acid that the body can synthesize in sufficient amounts.
B) An amino acid that is found only in plant-based foods.
C) An amino acid that must be obtained from the diet because the body cannot synthesize it.
D) An amino acid that contributes to muscle growth but not other bodily functions.
E) An amino acid primarily used for energy production.
Correct Answer: C) An amino acid that must be obtained from the diet because the body
cannot synthesize it.
Rationale: Essential amino acids are those that the human body cannot synthesize on its
own (or cannot synthesize in sufficient quantities) and therefore must be obtained through
dietary intake. There are nine essential amino acids for adults.
Question 12
Which food is considered a "complete protein" source, meaning it provides all nine essential
amino acids in adequate proportions?
A) Kidney beans
B) Peanut butter
C) Quinoa
D) Corn
E) Spinach
Correct Answer: C) Quinoa
Rationale: While most plant-based foods are considered "incomplete" proteins (lacking one
or more essential amino acids), quinoa is one of the few plant foods that is a complete
protein, along with soy and amaranth. Meat, poultry, fish, eggs, and dairy are also
complete protein sources.
Question 13
What is the recommended Dietary Reference Intake (DRI) for protein for a healthy adult (RDA)?
A) 0.5 g/kg of body weight
B) 0.8 g/kg of body weight
COMPLETE QUESTIONS WITH DETAILED VERIFIED ANSWERS
(100% CORRECT ANSWERS) ALREADY GRADED A+
Question 1
Which of the following macronutrients is the body's primary and most preferred source of
energy, especially for the brain and red blood cells?
A) Proteins
B) Fats
C) Vitamins
D) Carbohydrates
E) Minerals
Correct Answer: D) Carbohydrates
Rationale: Carbohydrates are the body's primary and most readily available source of
energy, providing glucose that is essential for the function of the brain, central nervous
system, and red blood cells. While fats and proteins can also provide energy, carbohydrates
are preferred and more efficiently utilized.
Question 2
What is the recommended Acceptable Macronutrient Distribution Range (AMDR) for
carbohydrates for adults?
A) 10-20% of total daily calories
B) 20-35% of total daily calories
C) 45-65% of total daily calories
D) 65-75% of total daily calories
E) Less than 10% of total daily calories
Correct Answer: C) 45-65% of total daily calories
Rationale: The Acceptable Macronutrient Distribution Range (AMDR) for carbohydrates in
adults is 45-65% of total daily calories. This range is associated with a reduced risk of
chronic disease while providing adequate intake of essential nutrients.
Question 3
Which monosaccharide is commonly known as "fruit sugar" and is found naturally in fruits,
honey, and some vegetables?
A) Glucose
B) Galactose
C) Sucrose
D) Fructose
E) Lactose
Correct Answer: D) Fructose
Rationale: Fructose is a monosaccharide often referred to as "fruit sugar" due to its
abundance in fruits. It is also a component of sucrose (table sugar) and is found in honey.
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Question 4
Lactose, the sugar found in milk, is a disaccharide composed of which two monosaccharides?
A) Glucose and Fructose
B) Glucose and Galactose
C) Fructose and Galactose
D) Glucose and Sucrose
E) Maltose and Glucose
Correct Answer: B) Glucose and Galactose
Rationale: Lactose is a disaccharide (a sugar made of two monosaccharide units) formed by
the chemical bonding of glucose and galactose. It is the primary carbohydrate found in
milk and dairy products.
Question 5
Which type of fiber is known for its ability to lower blood cholesterol and glucose levels, and is
found in oats, barley, nuts, seeds, and some fruits and vegetables?
A) Insoluble fiber
B) Soluble fiber
C) Cellulose
D) Lignin
E) Hemicellulose
Correct Answer: B) Soluble fiber
Rationale: Soluble fiber dissolves in water to form a gel-like material. It is known to help
lower blood cholesterol by binding to bile acids and reducing glucose absorption, thereby
helping to control blood sugar levels. Good sources include oats, barley, legumes, apples,
and citrus fruits.
Question 6
What is the primary function of glycogen in the human body?
A) To build and repair tissues.
B) To insulate organs and provide structural support.
C) To serve as the storage form of glucose in the liver and muscles.
D) To transport fats through the bloodstream.
E) To regulate fluid balance.
Correct Answer: C) To serve as the storage form of glucose in the liver and muscles.
Rationale: Glycogen is the highly branched polysaccharide that serves as the primary
storage form of glucose in animals. It is synthesized and stored predominantly in the liver
and muscles, acting as an readily available energy reserve.
Question 7
The complete digestion of carbohydrates primarily occurs in which part of the digestive tract?
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A) Stomach
B) Large intestine
C) Small intestine
D) Esophagus
E) Oral cavity
Correct Answer: C) Small intestine
Rationale: While carbohydrate digestion begins in the mouth with salivary amylase and
briefly continues in the stomach, the majority of carbohydrate digestion, particularly the
breakdown of disaccharides and complex carbohydrates into monosaccharides, occurs in
the small intestine through the action of pancreatic amylase and disaccharidases (lactase,
sucrase, maltase).
Question 8
Which of the following is a potential health benefit of consuming a diet rich in whole grains?
A) Increased risk of type 2 diabetes.
B) Increased risk of cardiovascular disease.
C) Reduced risk of constipation and colon cancer.
D) Decreased satiety and increased appetite.
E) Lower intake of essential vitamins and minerals.
Correct Answer: C) Reduced risk of constipation and colon cancer.
Rationale: Whole grains are rich in dietary fiber. Insoluble fiber adds bulk to stool,
promoting regularity and reducing the risk of constipation and diverticular disease, and
potentially colon cancer. Soluble fiber can help lower cholesterol and blood glucose. Whole
grains also provide essential vitamins and minerals.
Question 9
What is the recommended Adequate Intake (AI) for fiber for adult women?
A) 10 grams per day
B) 15 grams per day
C) 25 grams per day
D) 38 grams per day
E) 50 grams per day
Correct Answer: C) 25 grams per day
Rationale: The Adequate Intake (AI) for fiber for adult women is generally 25 grams per
day. For adult men, it is 38 grams per day.
Question 10
Which of the following accurately describes the role of protein in the body?
A) Primary source of immediate energy.
B) Main component of cell membranes, providing flexibility.
, [Type here]
C) Essential for building and repairing tissues, enzymes, and hormones.
D) Primarily responsible for insulation and shock absorption.
E) Solely functions as a genetic blueprint.
Correct Answer: C) Essential for building and repairing tissues, enzymes, and hormones.
Rationale: Proteins are fundamental to life, playing crucial roles in building and repairing
tissues, synthesizing enzymes (which catalyze biochemical reactions), hormones (which
regulate physiological processes), and other body compounds. They also contribute to
immune function, fluid balance, and acid-base balance.
Question 11
What is an "essential amino acid"?
A) An amino acid that the body can synthesize in sufficient amounts.
B) An amino acid that is found only in plant-based foods.
C) An amino acid that must be obtained from the diet because the body cannot synthesize it.
D) An amino acid that contributes to muscle growth but not other bodily functions.
E) An amino acid primarily used for energy production.
Correct Answer: C) An amino acid that must be obtained from the diet because the body
cannot synthesize it.
Rationale: Essential amino acids are those that the human body cannot synthesize on its
own (or cannot synthesize in sufficient quantities) and therefore must be obtained through
dietary intake. There are nine essential amino acids for adults.
Question 12
Which food is considered a "complete protein" source, meaning it provides all nine essential
amino acids in adequate proportions?
A) Kidney beans
B) Peanut butter
C) Quinoa
D) Corn
E) Spinach
Correct Answer: C) Quinoa
Rationale: While most plant-based foods are considered "incomplete" proteins (lacking one
or more essential amino acids), quinoa is one of the few plant foods that is a complete
protein, along with soy and amaranth. Meat, poultry, fish, eggs, and dairy are also
complete protein sources.
Question 13
What is the recommended Dietary Reference Intake (DRI) for protein for a healthy adult (RDA)?
A) 0.5 g/kg of body weight
B) 0.8 g/kg of body weight
