Question 1

Vitamins provide all the listed functions except:

Accepted Answer

Vitamins do not provide energy directly. They are essential for metabolic processes, help in tissue preservation, act as antioxidants, and serve as coenzymes in various biochemical reactions, but they do not serve as a direct source of energy like carbohydrates, fats, and proteins do.

Question 2

The thirteen essential, organic micronutrients that are needed by the body for normal functions are called

Accepted Answer

Vitamins are the thirteen essential, organic micronutrients required by the body for various biochemical functions, including growth, digestion, and nerve function. Minerals, enzymes, and coenzymes are also essential but serve different roles in the body's metabolism and biochemical processes.

Question 3

All vitamins are organic because they contain

Accepted Answer

Vitamins are considered organic compounds because they contain carbon, which is a fundamental element in all organic chemistry.

Question 4

_________are substances found in foods that are not in a form directly usable by the body, but that can be converted into an active form once they are absorbed; however vitamins found in foods that are already in the active form, called _________vitamins, do not undergo conversion.

Accepted Answer

Provitamins are substances found in foods that are not directly usable by the body but can be converted into an active form once absorbed. Preformed vitamins, on the other hand, are already in an active form when found in foods and do not require conversion.

Question 5

Hypervitaminosis or vitamin toxicity symptoms result when individuals

Accepted Answer

The answer of Hypervitaminosis or vitamin toxicity symptoms result when...

Question 6

Most water- soluble vitamins are not toxic because excesses are excreted in the

Accepted Answer

Most water-soluble vitamins, when consumed in excess, are excreted through the urine, preventing the accumulation of toxic levels in the body.

Question 7

To avoid toxicity symptoms, Dietary Reference Intakes include a tolerable upper intake level for most vitamins, and this is the level which

Accepted Answer

The tolerable upper intake level is the maximum amount of a nutrient that can be consumed daily without causing adverse health effects, and thus, it should not be exceeded to avoid toxicity symptoms.

Question 8

The vitamins which are more likely to lead to toxicity symptoms are the _________vitamins.

Accepted Answer

Fat-soluble vitamins (A, D, E, and K) are more likely to lead to toxicity symptoms because they can accumulate in the body's fat tissues and liver, unlike water-soluble vitamins, which are excreted in urine when consumed in excess.

Question 9

_________such as beta- carotene are converted to their active form before they can be directly used in the body.

Accepted Answer

Provitamins, such as beta-carotene, are substances that can be converted into active vitamins by the body. Beta-carotene, for example, is a provitamin that the body can convert into vitamin A.

Question 10

Vitamins A, D, E, and K are the _________vitamins, but the B vitamins are the_________vitamins.

Accepted Answer

Vitamins A, D, E, and K are fat-soluble, meaning they can be stored in the body's fatty tissue and liver. The B vitamins, on the other hand, are water-soluble and not stored in the body, thus requiring regular replenishment through diet.

Question 11

Vitamins A, D, and E are _________in the body's tissues.

Accepted Answer

Vitamins A, D, and E are fat-soluble vitamins, which means they can be stored in the body's fatty tissues and the liver for long periods, unlike water-soluble vitamins that are not stored and need to be replenished regularly.

Question 12

Since some fat- soluble vitamins can be stored in the body, it is _________to read the labels of these supplements carefully.

Accepted Answer

Fat-soluble vitamins can accumulate in the body, potentially leading to toxicity if consumed in excessive amounts, making it important to read supplement labels carefully.

Question 13

Which of the following nutrients is most bioavailable?

Accepted Answer

Vitamin A is the most bioavailable nutrient because it is easily absorbed by the body.

Question 14

Water- soluble vitamins are_________fat- soluble vitamins.

Accepted Answer

Water-soluble vitamins are generally more bioavailable than fat-soluble vitamins because they can be directly absorbed by the body's cells without needing to be broken down by bile acids in the intestine.

Question 15

Which vitamins are absorbed into the portal vein?

Accepted Answer

The B vitamins and vitamin C are water-soluble vitamins, which are absorbed directly into the blood and transported via the portal vein to the liver. Fat-soluble vitamins (A, D, E, and K) are absorbed along with dietary fats and do not directly enter the portal vein.

Question 16

Excess water- soluble vitamins are excreted through the

Accepted Answer

Water-soluble vitamins, such as vitamin C and the B vitamins, are not stored in the body in significant amounts and excess amounts are excreted through the urine.

Question 17

John started taking a multivitamin and noticed that his urine was yellow. This is because an excess of_________ was being excreted.

Accepted Answer

The B vitamins, particularly riboflavin (B2), are known to cause urine to turn a bright yellow color when taken in excess, as the body excretes the surplus.

Question 18

Which of the following nutrients are not stored in the body?

Accepted Answer

The B vitamins, which include thiamine, riboflavin, niacin, pantothenic acid, pyridoxine, biotin, folic acid, and cobalamin, are water-soluble and not stored in the body in significant amounts. They need to be consumed regularly as the body excretes excess amounts through urine.

Question 19

Which of the following nutrients requires dietary fat for absorption and is transported in the lymph system? Vitamin

Accepted Answer

Vitamin K is a fat-soluble vitamin, which means it requires dietary fat for its absorption and is transported in the lymphatic system.

Question 20

When the body's need for a vitamin is high, absorption of the nutrient is

Accepted Answer

When the body's need for a vitamin is high, its absorption is typically increased to meet the demand. This is a mechanism to ensure that nutritional needs are met efficiently.

Quiz 9: Fat-Soluble Vitamins