Question 1

Which of the following best describes oxidative stress in the human body?

Accepted Answer

An imbalance between free radical production and the body's detoxification and repair systems.

Question 2

Which of the following is a water-soluble antioxidant vitamin that must be obtained from the diet and is found in high concentrations in citrus fruits?

Accepted Answer

Vitamin C

Question 3

A patient presents with symptoms of bleeding gums, fatigue, and increased susceptibility to infection. Which vitamin deficiency is most likely responsible?

Accepted Answer

Vitamin C

Question 4

Which of the following statements about free radicals is TRUE?

Accepted Answer

Free radicals are highly reactive molecules with unpaired electrons.

Question 5

Which enzyme system is responsible for catalyzing the conversion of superoxide radicals into hydrogen peroxide?

Accepted Answer

Superoxide Dismutase (SOD)

Question 6

A diet rich in which of the following foods is most likely to increase your intake of carotenoids?

Accepted Answer

Vibrantly colored fruits and vegetables

Question 7

Which of the following minerals acts as an antioxidant but can become a pro-oxidant when present in excess?

Accepted Answer

Iron

Question 8

Which of the following best explains why antioxidant supplements may not provide the same health benefits as consuming antioxidant-rich foods?

Accepted Answer

Supplements lack the complex mixtures of nutrients and phytochemicals found in whole foods.

Question 9

Which of the following is a function of vitamin E in the body?

Accepted Answer

Enhances dilation of blood vessels and inhibits blood-clot formation

Question 10

A person with a diet deficient in selenium may be at increased risk for which of the following conditions?

Accepted Answer

Thyroid dysfunction and poor immune response

Question 11

Which of the following best describes the role of phytochemicals in human health?

Accepted Answer

They are plant chemicals that may act as antioxidants and have additional health-related effects.

Question 12

Which of the following scenarios is most likely to result in oxidative stress?

Accepted Answer

Exposure to smoke, heavy metals, or radiation, overwhelming the body's detoxification systems

Question 13

Which of the following is a real-life example of a hydrophobic antioxidant and its primary site of action?

Accepted Answer

Vitamin E protecting cell membranes

Question 14

Which of the following best explains why a variety of fruits and vegetables is recommended for optimal antioxidant intake?

Accepted Answer

A variety provides a complex mixture of nutrients and phytochemicals with additive and synergistic effects.

Question 15

Which of the following is a correct statement about the relationship between antioxidants and chronic disease?

Accepted Answer

Consuming antioxidant-rich foods is associated with decreased risk of chronic diseases.

Question 16

Which of the following is an example of a dietary strategy to increase antioxidant and phytochemical intake in a community?

Accepted Answer

Promoting farm-to-where-you-are programs and supporting local farmers’ markets

Question 17

Which of the following equations best represents the neutralization of a superoxide radical by superoxide dismutase?

Accepted Answer

$$2O_2$$^{-}$$ + 2H$$^{+}$$ \rightarrow H_2O_2 + O_2$

Question 18

Which of the following best describes the dual role of free radicals in the body?

Accepted Answer

They support immune function and cell signaling but can cause damage if not regulated.

Question 19

Which of the following is a function of flavonoids found in plant foods?

Accepted Answer

They act as effective free radical scavengers and are associated with lower risk of cardiovascular disease.

Question 20

Which of the following best explains why excessive intake of antioxidant minerals can be harmful?

Accepted Answer

In excess, they can accelerate the production of free radicals and act as pro-oxidants.

Antioxidant Nutrients and Their Role in Human Physiology

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