Quiz: Mineral Needs in Nutrition — 21 questions

1. Which characteristic best defines minerals in human nutrition?

A. They are inorganic elements that support body functions without providing energy

B. They are inorganic elements used primarily to produce dietary calories

C. They are organic compounds that supply energy for body functions

D. They are organic substances that regulate body functions through energy release

Answer: (A)

Explanation

Minerals are essential inorganic elements with structural, functional, and regulatory roles, but they do not provide energy. The plausible alternative confuses minerals with energy-yielding nutrients such as carbohydrates, fats, and proteins.

2. How do macro-element and trace-element intake recommendations differ?

A. Macro-elements generally require more than 100 mg per day, whereas trace elements require less

B. Both groups generally require more than 100 mg per day, with differences based on age

C. Both groups generally require less than 100 mg per day, with differences based on sex

D. Macro-elements generally require less than 100 mg per day, whereas trace elements require more

Answer: (A)

Explanation

Macro-elements have recommended intakes above 100 mg per day, while trace elements have recommended intakes below 100 mg per day. The reversed classification is the key misconception because it swaps the intake ranges of the two groups.

3. Why might a pregnant person require a different mineral intake from a nonpregnant adult?

A. Mineral requirements remain fixed because physiological conditions do not alter them

B. Mineral requirements change with food preferences rather than physiological conditions

C. Mineral requirements depend on mineral color and chemical form rather than body state

D. Mineral requirements can change with physiological conditions such as pregnancy

Answer: (D)

Explanation

Mineral requirements vary with age, sex, and conditions such as pregnancy, growth, and disease. The fixed-requirement view is incorrect because it does not account for changing physiological demands.

4. Which combination of functions is supported by calcium?

A. Carbohydrate digestion, visual pigment production, bile formation, and kidney filtration

B. Bone mineralization, muscle contraction, blood coagulation, and cell signaling

C. Oxygen transport, DNA replication, antibody production, and fat digestion

D. Thyroid hormone synthesis, glucose storage, skin pigmentation, and urine concentration

Answer: (B)

Explanation

Calcium contributes to bone and dental mineralization, neuromuscular contraction, blood coagulation, hormone secretion, and cell signaling. Oxygen transport is primarily an iron-related function, so that alternative assigns calcium a different mineral’s role.

5. What is the recommended calcium intake for adults aged 25 years and older, and what is the adult upper safety limit?

A. 1000 mg per day recommended, with an upper safety limit of 2500 mg per day

B. 1000 mg per day recommended, with an upper safety limit of 1500 mg per day

C. 950 mg per day recommended, with an upper safety limit of 1500 mg per day

D. 950 mg per day recommended, with an upper safety limit of 2500 mg per day

Answer: (D)

Explanation

From age 25 onward, the recommended calcium intake is 950 mg per day, while the adult upper safety limit is 2500 mg per day. The 1000 mg recommendation applies to ages 18–24, not to adults aged 25 years and older.

6. Through which mechanism does chromium regulate carbohydrate, lipid, and protein metabolism?

A. It transports oxygen by binding directly to hemoglobin

B. It acts through insulin-related metabolic regulation

C. It forms the mineral matrix of bones and teeth

D. It maintains fluid balance through chloride exchange

Answer: (B)

Explanation

Chromium regulates carbohydrate, lipid, and protein metabolism through insulin. Hemoglobin-mediated oxygen transport is an iron-related function, not the mechanism described for chromium.

7. Which role is characteristic of copper in the body?

A. It provides the main mineral structure of bones and teeth

B. It serves as an enzymatic cofactor and contributes to iron metabolism

C. It carries oxygen in the blood as the central atom of hemoglobin

D. It regulates carbohydrate metabolism through insulin action

Answer: (B)

Explanation

Copper acts as an enzymatic cofactor in redox reactions and supports iron metabolism, connective tissue, ossification, neurotransmission, immunity, and cardiac function. The insulin-related metabolic role belongs to chromium, making that alternative a cross-mineral confusion.

8. Which statement correctly distinguishes heme iron from non-heme iron?

A. Heme iron is present in all foods and depends on body stores, whereas non-heme iron comes mainly from seafood

B. Heme iron comes mainly from plant foods and has variable absorption, whereas non-heme iron is highly absorbed

C. Heme iron comes mainly from animal foods and is highly absorbed, whereas non-heme absorption depends on diet and body stores

D. Heme iron and non-heme iron have similar absorption because dietary context does not affect either form

Answer: (C)

Explanation

Heme iron is found in meat, offal, fish, and seafood and has high absorption, whereas non-heme iron is widespread, especially in plant foods, and its absorption depends on dietary context and body stores. The opposing description reverses the food sources and absorption characteristics of the two forms.

9. What is the recommended iron intake for a woman aged 18 years or older who menstruates, and what is the upper safety limit?

A. It is 16 mg per day regardless of menstruation, with an upper limit of 25 mg per day

B. It is 11 mg per day regardless of menstruation, with an upper limit of 40 mg per day

C. It is 11–16 mg per day depending on menstruation, with an upper limit of 40 mg per day

D. It is 11–16 mg per day depending on menstruation, with an upper limit of 25 mg per day

Answer: (C)

Explanation

For women aged 18 years or older, the recommended iron intake is 11–16 mg per day according to menstruation, and the upper safety limit is 40 mg per day. The fixed 11 mg value applies to men in this age group, not to menstruating women.

10. Which physiological process depends directly on iodine availability?

A. Activation of enzymes involved in amino-acid metabolism

B. Dental mineralization and prevention of tooth decay

C. Regulation of osmotic balance and intestinal absorption

D. Thyroid-hormone synthesis and fetal brain development

Answer: (D)

Explanation

Iodine is needed to synthesize thyroid hormones and supports growth, thermogenesis, energy metabolism, and fetal brain development. Dental mineralization is associated with fluoride, while amino-acid metabolism is linked to molybdenum and osmotic balance to sodium.

11. Which statement correctly distinguishes iodine intake recommendations?

A. The adequate intake is 70 µg/day, while the upper safety limit is 255 µg/day.

B. The adequate intake is 600 µg/day, while the upper safety limit is 150 µg/day.

C. The adequate intake is 3.4 mg/day, while the upper safety limit is 7 mg/day.

D. The adequate intake is 150 µg/day, while the upper safety limit is 600 µg/day.

Answer: (D)

Explanation

Iodine has an adequate intake of 150 µg/day and an upper safety limit of 600 µg/day. The values of 70 and 255 µg/day apply to selenium, whereas 3.4 and 7 mg/day refer to fluoride for men and its upper limit.

12. A nutrient is needed for ATP energy transport, acid-base balance, cell signaling, and membrane structure; which nutrient is it?

A. Fluoride

B. Iodine

C. Phosphorus

D. Molybdenum

Answer: (C)

Explanation

Phosphorus contributes to ATP energy transport, acid-base balance, cell signaling, membrane structure, and bone and dental mineralization. Iodine is central to thyroid-hormone function, fluoride supports dental mineralization, and molybdenum acts as an enzyme cofactor.

13. Which combination best describes the physiological roles of magnesium?

A. Enzyme activation, ATP production, ion transport, and neuromuscular function

B. Thyroid-hormone synthesis, fetal development, thermogenesis, and cell maturation

C. Osmotic regulation, nerve transmission, cardiac function, and nutrient absorption

D. Antioxidant defense, thyroid metabolism, wound healing, and taste function

Answer: (A)

Explanation

Magnesium activates enzymes, supports ATP production and ion transport, contributes to calcium and potassium metabolism, and enables neuromuscular function. The other combinations primarily describe iodine, sodium, or selenium and zinc functions.

14. To which form of magnesium does the 250 mg/day upper safety limit apply?

A. Magnesium naturally present in foods such as grains and mineral water

B. All magnesium consumed from food and supplements combined

C. Dissociable magnesium and magnesium oxide provided as food supplements

D. Magnesium obtained from oilseeds, dark chocolate, and coffee

Answer: (C)

Explanation

The 250 mg/day limit applies to dissociable magnesium and magnesium oxide supplied as food supplements. Naturally occurring magnesium in foods is excluded from this specific upper safety limit.

15. Which function is most directly associated with potassium?

A. Supporting nerve transmission, muscle contraction, and cardiac function

B. Contributing to bone mineralization, ATP transport, and membrane structure

C. Serving as a cofactor for enzymes that metabolize amino acids

D. Activating enzymes and enabling calcium and magnesium metabolism

Answer: (A)

Explanation

Potassium supports nerve transmission, muscle contraction, cardiac function, insulin secretion, energy metabolism, and acid-base balance. Bone mineralization and ATP transport involve phosphorus, enzyme activation is a major magnesium role, and amino-acid metabolism involves molybdenum.

16. How does sodium contribute to nutrient handling in the body?

A. It supports intestinal and renal absorption of various nutrients.

B. It strengthens antioxidant defenses and thyroid-hormone metabolism.

C. It enables thyroid-hormone synthesis and fetal brain development.

D. It contributes to wound healing, reproduction, and skin function.

Answer: (A)

Explanation

Sodium regulates osmotic balance and contributes to nerve transmission, muscle contraction, and intestinal and renal absorption of various nutrients. The other choices describe major roles of iodine, selenium, or zinc.

17. Which statement correctly distinguishes sodium intake recommendations?

A. The adequate intake is 1500 mg/day, while the upper safety limit is 2300 mg/day.

B. The adequate intake is 2300 mg/day, while the upper safety limit is 1500 mg/day.

C. The adequate intake is 70 µg/day, while the upper safety limit is 255 µg/day.

D. The adequate intake is 25 mg/day, while the upper safety limit is 9.4–14 mg/day.

Answer: (A)

Explanation

Sodium has an adequate intake of 1500 mg/day and an upper safety limit of 2300 mg/day. The other numerical pairs refer to zinc or selenium and do not describe sodium recommendations.

18. Which nutrient contributes to the function of more than 200 enzymes and also supports immunity and wound healing?

A. Sodium

B. Iodine

C. Zinc

D. Selenium

Answer: (C)

Explanation

Zinc contributes to the function of more than 200 enzymes and supports growth, immunity, wound healing, reproduction, taste, and skin function. Sodium is mainly involved in fluid balance and nerve and muscle function, while selenium and iodine have different primary roles.

19. Which statement accurately describes zinc intake recommendations?

A. Recommendations vary by sex and dietary phytate, while the upper safety limit is 25 mg/day for both.

B. Recommendations are 25 mg/day for both sexes, while the upper safety limit varies with dietary phytate.

C. Recommendations are 70 µg/day for both sexes, while the upper safety limit is 255 µg/day.

D. Recommendations are 1500 mg/day for both sexes, while the upper safety limit is 2300 mg/day.

Answer: (A)

Explanation

Zinc recommendations are 9.4–14 mg/day for men and 7.5–11 mg/day for women, depending on dietary phytate, with a 25 mg/day upper safety limit for both. The other numerical values describe selenium or sodium, and the second option reverses the zinc relationship.

20. Which set of categories describes the possible roles of minerals in the body?

A. Structural, functional, enzymatic, or regulatory

B. Thermal, muscular, genetic, or protective

C. Absorptive, circulatory, skeletal, or metabolic

D. Digestive, respiratory, hormonal, or sensory

Answer: (A)

Explanation

Minerals may contribute in structural, functional, enzymatic, or regulatory ways. The other sets combine physiological processes or systems rather than the stated categories of mineral roles.

21. How is arsenic characterized in the nutritional mineral material?

A. It is identified as a structural mineral obtained mainly from dairy foods.

B. It is presented as an enzyme regulator with a specified daily intake.

C. It is described as a functional mineral supplied through fortified grains.

D. It is listed without a stated function, food source, or intake recommendation.

Answer: (D)

Explanation

Arsenic is mentioned without an accompanying function, food source, or intake recommendation. The alternatives incorrectly assign it a nutritional role, source, or recommendation that is not provided.