FINAL EXAM
PASS.
C O L L E G E O F H E A LT H S C I E N C E S · N U T R I T I O N P R O G R A M
BIOD 121 Nutrition Final
Part 2 — Practice Question Bank
Vitamins B & C, Minerals, Water Balance & Deficiency States
FINAL REVIEW:
Water-Soluble Vitamins, Mineral Absorption & Deficiency
— Electrolyte Balance & Nutrient Bioavailability
Edition 1 · July 2026
EXAM FOCUSED DETAILED VITAMINS & BUILD CONFIDENCE
RATIONALES MINERALS
Aligned with BIOD 121 Master your BIOD 121 Final
objectives Clear explanations for mastery B/C vitamins, iron, zinc &
more
P r e pa r e · P r a c t i c e · Pa s s
Excellence in Nutrition Science Education
,BIOD 121 FINAL · PART 2 QUESTIONS 1–30
Section 1: Vitamins, Bioavailability & Mineral Absorption
1 Which vitamins are produced by gut (intestinal) bacteria?
A Both Biotin and Vitamin K are produced by intestinal bacteria
B Only Vitamin C is produced by gut flora
C All B vitamins are exclusively produced by intestinal bacteria
D No vitamins are produced by gut bacteria
CORRECT ANSWER: A
RATIONALE: The gut microbiome synthesizes two essential vitamins: biotin
(a B vitamin involved in energy metabolism) and vitamin K (essential for
blood clotting). This endogenous production supplements dietary intake
but is generally insufficient to meet total body requirements without
dietary sources.
2 Vitamin E is an antioxidant found in cell membranes that:
A Decreases the risk for cancer and cell damage by protecting membrane
lipids from oxidation
B Primarily functions in blood clotting cascades
C Is only found in water-soluble food sources
D Has no significant role in human health
CORRECT ANSWER: A
RATIONALE: Vitamin E (tocopherol) is the body's primary fat-soluble
antioxidant — it embeds within cell membranes and protects
polyunsaturated fatty acids from free radical damage. This membrane
protection reduces cancer risk and cellular aging. Deficiency is rare but can
lead to RBC hemolysis. Rich sources include vegetable oils, nuts, seeds, and
whole grains.
, 3 Bioavailability is defined as:
A The degree to which a nutrient is absorbed and available to be used by
the body
B The total amount of a nutrient in a food source
C The rate at which a nutrient is excreted from the body
D The chemical structure of a vitamin molecule
CORRECT ANSWER: A
RATIONALE: Bioavailability describes the proportion of an ingested nutrient
that is actually absorbed and utilized — not simply the amount present in
food. Many factors affect bioavailability: chemical form (heme vs. non-
heme iron), competing substances (fiber binding minerals), enhancing
factors (vitamin C with iron), and individual physiological status (deficiency
increases absorption).
4 Folate deficiency in pregnant women can result in:
A Neural tube defects in the developing fetus
B Enhanced fetal brain development
C Increased maternal energy levels
D Improved immune function
CORRECT ANSWER: A
RATIONALE: Folate (vitamin B9) is critical during the first weeks of
pregnancy when the neural tube closes — deficiency causes neural tube
defects including spina bifida and anencephaly. This is why women of
childbearing age are advised to consume adequate folate (400 mcg/day)
before conception, as the neural tube closes before many women know
they are pregnant.
PASS.
C O L L E G E O F H E A LT H S C I E N C E S · N U T R I T I O N P R O G R A M
BIOD 121 Nutrition Final
Part 2 — Practice Question Bank
Vitamins B & C, Minerals, Water Balance & Deficiency States
FINAL REVIEW:
Water-Soluble Vitamins, Mineral Absorption & Deficiency
— Electrolyte Balance & Nutrient Bioavailability
Edition 1 · July 2026
EXAM FOCUSED DETAILED VITAMINS & BUILD CONFIDENCE
RATIONALES MINERALS
Aligned with BIOD 121 Master your BIOD 121 Final
objectives Clear explanations for mastery B/C vitamins, iron, zinc &
more
P r e pa r e · P r a c t i c e · Pa s s
Excellence in Nutrition Science Education
,BIOD 121 FINAL · PART 2 QUESTIONS 1–30
Section 1: Vitamins, Bioavailability & Mineral Absorption
1 Which vitamins are produced by gut (intestinal) bacteria?
A Both Biotin and Vitamin K are produced by intestinal bacteria
B Only Vitamin C is produced by gut flora
C All B vitamins are exclusively produced by intestinal bacteria
D No vitamins are produced by gut bacteria
CORRECT ANSWER: A
RATIONALE: The gut microbiome synthesizes two essential vitamins: biotin
(a B vitamin involved in energy metabolism) and vitamin K (essential for
blood clotting). This endogenous production supplements dietary intake
but is generally insufficient to meet total body requirements without
dietary sources.
2 Vitamin E is an antioxidant found in cell membranes that:
A Decreases the risk for cancer and cell damage by protecting membrane
lipids from oxidation
B Primarily functions in blood clotting cascades
C Is only found in water-soluble food sources
D Has no significant role in human health
CORRECT ANSWER: A
RATIONALE: Vitamin E (tocopherol) is the body's primary fat-soluble
antioxidant — it embeds within cell membranes and protects
polyunsaturated fatty acids from free radical damage. This membrane
protection reduces cancer risk and cellular aging. Deficiency is rare but can
lead to RBC hemolysis. Rich sources include vegetable oils, nuts, seeds, and
whole grains.
, 3 Bioavailability is defined as:
A The degree to which a nutrient is absorbed and available to be used by
the body
B The total amount of a nutrient in a food source
C The rate at which a nutrient is excreted from the body
D The chemical structure of a vitamin molecule
CORRECT ANSWER: A
RATIONALE: Bioavailability describes the proportion of an ingested nutrient
that is actually absorbed and utilized — not simply the amount present in
food. Many factors affect bioavailability: chemical form (heme vs. non-
heme iron), competing substances (fiber binding minerals), enhancing
factors (vitamin C with iron), and individual physiological status (deficiency
increases absorption).
4 Folate deficiency in pregnant women can result in:
A Neural tube defects in the developing fetus
B Enhanced fetal brain development
C Increased maternal energy levels
D Improved immune function
CORRECT ANSWER: A
RATIONALE: Folate (vitamin B9) is critical during the first weeks of
pregnancy when the neural tube closes — deficiency causes neural tube
defects including spina bifida and anencephaly. This is why women of
childbearing age are advised to consume adequate folate (400 mcg/day)
before conception, as the neural tube closes before many women know
they are pregnant.
