Question 1

Which of the following best describes the primary function of electrolytes in maintaining fluid balance within the human body?

Accepted Answer

They help regulate the movement of water between body compartments by creating osmotic gradients.

Question 2

A patient presents with muscle cramps, confusion, and irregular heartbeat after running a marathon on a hot day. Which electrolyte imbalance is most likely responsible for these symptoms?

Accepted Answer

Hyponatremia

Question 3

Which of the following phytochemical groups is primarily responsible for the red, blue, and purple pigmentation in fruits such as berries and grapes?

Accepted Answer

Flavonoids (Anthocyanins)

Question 4

Which nutrient acts as a coenzyme in the antioxidant enzyme glutathione peroxidase, thereby supporting the body's defense against oxidative damage?

Accepted Answer

Selenium

Question 5

A deficiency in which micronutrient is most likely to result in impaired collagen synthesis, leading to symptoms such as bleeding gums and poor wound healing?

Accepted Answer

Vitamin C

Question 6

Which of the following nutrients is essential for the absorption of calcium from the gastrointestinal tract?

Accepted Answer

Vitamin D

Question 7

A 65-year-old woman is diagnosed with osteoporosis. Which combination of nutrients would be most critical to recommend for her bone health?

Accepted Answer

Calcium and Vitamin D

Question 8

Which micronutrient is directly involved in the synthesis of hemoglobin and its deficiency can lead to microcytic anemia?

Accepted Answer

Iron

Question 9

A patient with a diet low in leafy green vegetables and dairy is at risk for which of the following conditions related to blood health?

Accepted Answer

Impaired blood clotting due to vitamin K deficiency

Question 10

Which of the following equations correctly represents the calculation for Body Mass Index (BMI)?

Accepted Answer

$$BMI = \frac{weight\ (kg)}{height\ (m)^2$}$$

Question 11

Which micronutrient is a coenzyme in the conversion of pyruvate to acetyl-CoA, a critical step in energy metabolism?

Accepted Answer

Vitamin B1 (Thiamin)

Question 12

A patient presents with fatigue, glossitis, and megaloblastic anemia. Which pair of micronutrients is most likely deficient?

Accepted Answer

Vitamin B12 and Folate

Question 13

Which of the following best explains why vitamin E is considered a significant antioxidant in cell membranes?

Accepted Answer

It donates electrons to neutralize free radicals, preventing lipid peroxidation.

Question 14

Which of the following nutrients plays a supporting role in antioxidant defense by regenerating oxidized vitamin E to its active form?

Accepted Answer

Vitamin C

Question 15

A person consumes a diet rich in cruciferous vegetables such as broccoli and Brussels sprouts. Which group of phytochemicals are they most likely increasing in their diet?

Accepted Answer

Glucosinolates

Question 16

Which of the following nutrients is required for the carboxylation of osteocalcin, a protein essential for bone mineralization?

Accepted Answer

Vitamin K

Question 17

A patient with chronic alcoholism is found to have Wernicke-Korsakoff syndrome. Which micronutrient deficiency is most likely responsible?

Accepted Answer

Vitamin B1 (Thiamin)

Question 18

Which of the following best describes the role of sodium in nerve impulse transmission?

Accepted Answer

Sodium influx during depolarization initiates the action potential.

Question 19

A patient is found to have macrocytic anemia and neurological symptoms. Which nutrient deficiency should be suspected, and why?

Accepted Answer

Vitamin B12, because it is required for myelin synthesis and DNA replication.

Question 20

Which of the following nutrients is a cofactor for the enzyme superoxide dismutase, which catalyzes the conversion of superoxide radicals to hydrogen peroxide?

Accepted Answer

Zinc

Key Nutrition Concepts: Fluid Balance, Phytochemicals, Antioxidants, Bone & Blood Health, Energy Metabolism

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