DHN 101 Exam 3
Actual Exam Questions and Answers Practice Questions
A+ GRADED
Welcome to DHN 101 Exam 3 Practice Examination. This comprehensive test bank covers
essential nutrition concepts including cancer biology, vitamin synthesis and metabolism, mineral
functions, and dietary guidelines. The exam consists of 250 multiple-choice and fill-in-the-blank
questions designed to assess your understanding of key nutritional science principles. Each
question includes the correct answer and a brief rationale to enhance your learning
experience.
Domains Covered:
1. Cancer Biology and Cellular Growth (Questions 1-25)
2. Vitamin D Synthesis and Metabolism (Questions 26-50)
3. B-Vitamins and Coenzymes (Questions 51-80)
4. Vitamin K and Blood Clotting (Questions 81-95)
5. Vitamin E and Antioxidant Functions (Questions 96-115)
6. Calcium and Bone Health (Questions 116-140)
7. Mineral Deficiencies and Health Risks (Questions 141-170)
8. Food Sources and Nutrient Density (Questions 171-200)
9. Government Regulations and Dietary Guidelines (Questions 201-225)
10. Comprehensive Review and Application (Questions 226-250)
QUESTION 1
An agent that is cancer-causing is said to be ______.
A) mutagenic
B) teratogenic
C) carcinogenic
D) pathogenic
Answer: C) carcinogenic
Rationale: Carcinogenic agents are substances or exposures that can lead to cancer by
causing cellular changes and DNA damage. The term specifically refers to cancer-causing
agents.
QUESTION 2
,Cancerous cells that divide repeatedly and frequently and do not die are called ______
cells.
A) benign
B) malignant
C) apoptotic
D) necrotic
Answer: B) malignant
Rationale: Malignant cells are characterized by uncontrolled division, evasion of
programmed cell death (apoptosis), and the ability to invade surrounding tissues.
QUESTION 3
If these cells grow together to form masses, the masses are called ______, which invade
body tissues and metastasize to other parts of the body.
A) benign tumors
B) malignant tumors
C) polyps
D) cysts
Answer: B) malignant tumors
Rationale: Malignant tumors are cancerous growths that have the capacity to invade
nearby tissues and spread (metastasize) to distant body sites through blood or lymphatic
systems.
QUESTION 4
Some cells multiply excessively and form ______ which are not cancerous.
A) malignant tumors
B) benign tumors
C) sarcomas
D) carcinomas
Answer: B) benign tumors
Rationale: Benign tumors are non-cancerous growths that do not invade surrounding tissues
or metastasize. They typically grow slowly and remain localized.
,QUESTION 5
Which of the following factors results in LESS vitamin D synthesis?
A) Summer months compared to winter months
B) Southern latitudes compared to northern latitudes
C) Older persons compared to younger persons
D) More time in the sun compared to less time in the sun
Answer: C) Older persons compared to younger persons
Rationale: Older individuals have reduced capacity for vitamin D synthesis due to thinner
skin and decreased levels of the cholesterol-like precursor in the skin. Darker skin
pigmentation, less sun exposure, and winter months also reduce synthesis.
QUESTION 6
Which of the following factors results in LESS vitamin D synthesis?
A) Younger persons compared to older persons
B) Light skinned persons compared to dark skinned persons
C) More time in the sun compared to less time
D) Summer months compared to winter months
Answer: B) Light skinned persons compared to dark skinned persons
Rationale: Dark-skinned individuals require more sun exposure to produce the same
amount of vitamin D because melanin reduces UVB penetration. Lighter skin synthesizes
vitamin D more efficiently.
QUESTION 7
Which of the following factors results in MORE vitamin D synthesis?
A) Winter months compared to summer months
B) Northern latitudes compared to southern latitudes
C) Summer months compared to winter months
D) Older age compared to younger age
Answer: C) Summer months compared to winter months
, Rationale: Summer months provide more intense UVB radiation from the sun, which is
necessary for the conversion of cholesterol precursors to vitamin D in the skin. Winter
months have weaker UVB rays.
QUESTION 8
Which of the following factors results in MORE vitamin D synthesis?
A) Northern latitudes compared to southern latitudes
B) Southern latitudes compared to northern latitudes
C) Winter compared to summer
D) Dark skin compared to light skin
Answer: B) Southern latitudes compared to northern latitudes
Rationale: Southern latitudes receive more direct sunlight and higher UVB radiation
throughout the year, promoting greater vitamin D synthesis in the skin compared to
northern latitudes.
QUESTION 9
Vitamin D is unique in that it can be obtained by the diet but also is synthesized inside the
body when a cholesterol-like substance is activated by sunlight and converted to the
prohormone vitamin D. What two organs serve as the sites of active vitamin D synthesis?
A) Skin and intestines
B) Liver and kidneys
C) Pancreas and gallbladder
D) Heart and lungs
Answer: B) Liver and kidneys
Rationale: The liver converts vitamin D to 25-hydroxyvitamin D, and the kidneys further
hydroxylate it to the active form, 1,25-dihydroxyvitamin D. Both organs are essential for
vitamin D activation.
QUESTION 10
Which of the following foods are reliable dietary sources of vitamin D?
A) Fresh fruits and vegetables
B) Fortified dairy products
Actual Exam Questions and Answers Practice Questions
A+ GRADED
Welcome to DHN 101 Exam 3 Practice Examination. This comprehensive test bank covers
essential nutrition concepts including cancer biology, vitamin synthesis and metabolism, mineral
functions, and dietary guidelines. The exam consists of 250 multiple-choice and fill-in-the-blank
questions designed to assess your understanding of key nutritional science principles. Each
question includes the correct answer and a brief rationale to enhance your learning
experience.
Domains Covered:
1. Cancer Biology and Cellular Growth (Questions 1-25)
2. Vitamin D Synthesis and Metabolism (Questions 26-50)
3. B-Vitamins and Coenzymes (Questions 51-80)
4. Vitamin K and Blood Clotting (Questions 81-95)
5. Vitamin E and Antioxidant Functions (Questions 96-115)
6. Calcium and Bone Health (Questions 116-140)
7. Mineral Deficiencies and Health Risks (Questions 141-170)
8. Food Sources and Nutrient Density (Questions 171-200)
9. Government Regulations and Dietary Guidelines (Questions 201-225)
10. Comprehensive Review and Application (Questions 226-250)
QUESTION 1
An agent that is cancer-causing is said to be ______.
A) mutagenic
B) teratogenic
C) carcinogenic
D) pathogenic
Answer: C) carcinogenic
Rationale: Carcinogenic agents are substances or exposures that can lead to cancer by
causing cellular changes and DNA damage. The term specifically refers to cancer-causing
agents.
QUESTION 2
,Cancerous cells that divide repeatedly and frequently and do not die are called ______
cells.
A) benign
B) malignant
C) apoptotic
D) necrotic
Answer: B) malignant
Rationale: Malignant cells are characterized by uncontrolled division, evasion of
programmed cell death (apoptosis), and the ability to invade surrounding tissues.
QUESTION 3
If these cells grow together to form masses, the masses are called ______, which invade
body tissues and metastasize to other parts of the body.
A) benign tumors
B) malignant tumors
C) polyps
D) cysts
Answer: B) malignant tumors
Rationale: Malignant tumors are cancerous growths that have the capacity to invade
nearby tissues and spread (metastasize) to distant body sites through blood or lymphatic
systems.
QUESTION 4
Some cells multiply excessively and form ______ which are not cancerous.
A) malignant tumors
B) benign tumors
C) sarcomas
D) carcinomas
Answer: B) benign tumors
Rationale: Benign tumors are non-cancerous growths that do not invade surrounding tissues
or metastasize. They typically grow slowly and remain localized.
,QUESTION 5
Which of the following factors results in LESS vitamin D synthesis?
A) Summer months compared to winter months
B) Southern latitudes compared to northern latitudes
C) Older persons compared to younger persons
D) More time in the sun compared to less time in the sun
Answer: C) Older persons compared to younger persons
Rationale: Older individuals have reduced capacity for vitamin D synthesis due to thinner
skin and decreased levels of the cholesterol-like precursor in the skin. Darker skin
pigmentation, less sun exposure, and winter months also reduce synthesis.
QUESTION 6
Which of the following factors results in LESS vitamin D synthesis?
A) Younger persons compared to older persons
B) Light skinned persons compared to dark skinned persons
C) More time in the sun compared to less time
D) Summer months compared to winter months
Answer: B) Light skinned persons compared to dark skinned persons
Rationale: Dark-skinned individuals require more sun exposure to produce the same
amount of vitamin D because melanin reduces UVB penetration. Lighter skin synthesizes
vitamin D more efficiently.
QUESTION 7
Which of the following factors results in MORE vitamin D synthesis?
A) Winter months compared to summer months
B) Northern latitudes compared to southern latitudes
C) Summer months compared to winter months
D) Older age compared to younger age
Answer: C) Summer months compared to winter months
, Rationale: Summer months provide more intense UVB radiation from the sun, which is
necessary for the conversion of cholesterol precursors to vitamin D in the skin. Winter
months have weaker UVB rays.
QUESTION 8
Which of the following factors results in MORE vitamin D synthesis?
A) Northern latitudes compared to southern latitudes
B) Southern latitudes compared to northern latitudes
C) Winter compared to summer
D) Dark skin compared to light skin
Answer: B) Southern latitudes compared to northern latitudes
Rationale: Southern latitudes receive more direct sunlight and higher UVB radiation
throughout the year, promoting greater vitamin D synthesis in the skin compared to
northern latitudes.
QUESTION 9
Vitamin D is unique in that it can be obtained by the diet but also is synthesized inside the
body when a cholesterol-like substance is activated by sunlight and converted to the
prohormone vitamin D. What two organs serve as the sites of active vitamin D synthesis?
A) Skin and intestines
B) Liver and kidneys
C) Pancreas and gallbladder
D) Heart and lungs
Answer: B) Liver and kidneys
Rationale: The liver converts vitamin D to 25-hydroxyvitamin D, and the kidneys further
hydroxylate it to the active form, 1,25-dihydroxyvitamin D. Both organs are essential for
vitamin D activation.
QUESTION 10
Which of the following foods are reliable dietary sources of vitamin D?
A) Fresh fruits and vegetables
B) Fortified dairy products
