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WorksheetsDefenisi Vitamin
Total questions: 10
Worksheet time: 5mins
Which statement best defines a vitamin according to the material?
A large inorganic compound that provides energy directly to cells
A group of small-molecule organic compounds with vital functions in metabolism that the body cannot produce sufficiently
A protein complex synthesized in the liver to regulate enzymes
A carbohydrate polymer essential for structural support
Which statement correctly contrasts excretion pathways of fat-soluble and water-soluble vitamins?
Fat-soluble vitamins are primarily excreted in urine; water-soluble vitamins via bile.
Fat-soluble vitamins are excreted in small amounts through bile; water-soluble vitamins are excreted in urine.
Both fat- and water-soluble vitamins are excreted mainly through feces.
Neither type of vitamin is excreted; both accumulate indefinitely.
Which statement best describes the solubility of Ergokalsiferol (Vitamin D)?
Insoluble in water; soluble in ethanol, chloroform, ether, and fatty oils
Soluble in water; insoluble in ethanol and chloroform
Insoluble in both water and organic solvents
Soluble only in ether and water
According to the introduction, how can people obtain Vitamin E?
By synthesizing it in the liver
Through exposure to sunlight
From various foods or supplements
Only through prescription medication
What distinguishes different types of Vitamin E according to the chemical structure explanation?
The presence of sulfur atoms in the ring
The number and position of methyl branches attached to the benzene group (R groups)
The length of the central peptide chain
The degree of hydrogenation of the double bonds
Which tocopherol is characterized by a single methyl group at R3 only?
Alpha-tocopherol
Beta-tocopherol
Gamma-tocopherol
Delta-tocopherol
What does the term “5,7,8-trimethyl” in the alpha-tocopherol entry indicate about its ring substitution?
Three methyl groups are attached to positions 5, 7, and 8 on the aromatic ring.
Two methyl groups are attached at positions 5 and 8.
One methyl group is attached at position 5 only.
No methyl groups are attached to the ring.
During the qualitative identification, for how long and at what temperature is the mixture heated?
5 minutes at 60°C
10 minutes at 90°C
15 minutes at 75°C
20 minutes at 100°C
What observable outcome indicates a positive qualitative identification for Vitamin E in the described test?
Formation of a blue precipitate
Release of gas bubbles
Color change from orange to red
Appearance of a green fluorescence
Which step immediately precedes heating in the qualitative identification diagram?
Neutralizing with sodium bicarbonate
Adding absolute alcohol and concentrated HNO3 to the sample
Filtering the mixture
Cooling the solution on ice
