ACTIVITY 5

Question 1

• are organic compounds required as cofactors or coenzymes for certain enzymes
• may not be synthesized in sufficient amounts by the body
• must be provided in our diet

Answer 1

Vitamins

Question 2

The deficiency of a vitamin in the diet can affect the activity of an enzymes, resulting in a _____________ disease

Answer 2

deficiency disease

Question 3

Two Categories of Vitamins

Answer 3

Fat-soluble and Water-soluble vitamins

Question 4

vitamins that could accumulate in our fatty tissues bringing about symptoms of excess or ____________

Answer 4

hypervitaminosis

Question 5

solubility of a certain vitamin indicate what foods contain that vitamin, T or F

Answer 5

F,
solubility of a certain vitamin does not indicate much about what foods contain that vitamin

Question 6

fat-soluble class

Answer 6

Vitamins A, D, E, K

Question 7

water-soluble vitamins

Answer 7

vitamin C and B-complex vitamins

Question 8

B complex Vitamins (There is no single compound classified as “vitamin B”.)

Answer 8

B1 - thiamin
B2 - riboflavin
B3 - pantothenic acid
B4 - niacin
B6 - pyridoxine
B7 - cobalamin

Question 9

are agents that can prevent the oxidation of other compounds because they are so easily oxidized.

before other compounds are oxidized, these are oxidized first.

This makes them GOOD REDUCING AGENTS.

Answer 9

antioxidants

Question 10

The presence of antioxidants can be detected by their reaction with ______

Answer 10

Iodine, I2

Question 11

The antioxidants is oxidized and the I2 is reduced. The redox reaction convers the ______ (color) I2 into ______

Answer 11

red-violet I2 into colorless I-

Question 12

Vitamin C loses its antioxidizing agent when it is ___________

Answer 12

heated

Question 13

The determination of the amount of vitamin C destroyed is determined by _____________ with ______ using ___________ as INDICATOR.

Answer 13

titration, iodine solution, starch solution

Question 14

When Iodine (I2) is present, the starch turns a __________ color

Answer 14

deep-blue color

Question 15

When vitamin C is in the solution, the _________, and the starch does not form the blue-black color.

Answer 15

the I2 is reduced to Iodide (I-)

Question 16

When vitamins is added with water,
if there is a separate layer then it is not ____________,
if the vitamin dissolves to give a clear solution, it is __________.

Answer 16

water-soluble,
water-soluble

Question 17

Organic solvent used to test when the vitamins is not soluble in water

Answer 17

methylene chloride (CH2Cl2)

Question 18

which vitamins are antioxidants

Answer 18

A, C and E

Question 19

Which vitamins would be excreted daily?

Answer 19

C and B since they are water-soluble and can be absorbed by the body

Question 20

The mass of vitamin C in mg that reacts with 1 ml of iodine solution

Answer 20

vitamin C-iodine solution TITER