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Вопрос № 190671 - Английский язык

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Why is vitamin C treated as a vitamin?
Варианты ответов
  • It is a water-soluble substance.
  • It should be included in a diet.
  • It is distinct from other organic compounds.
  • It can not be synthesised by a man.
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Вопрос задал(а): Анонимный пользователь, 10 Ноябрь 2020 в 00:07
На вопрос ответил(а): Анастасия Степанова, 10 Ноябрь 2020 в 00:07

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Вопрос № 911575

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What are Vitamin B1, Vitamin B2, Vitamin B6, Vitamin B12, Vitamin С and other stated to belong to?
Vitamin B1, Vitamin B2, Vitamin B6, Vitamin B12, Vitamin С and other are stated to belong to the water-soluble vitamin class. Vitamin B2 (riboflavine) is built up from a ribose and isoalloxazine residue, the name riboflavine being derived from the sugar component and the intense yellow fluorescence of it’s agucous solution.
They are stated to belong to the intense yellow fluorescence of sugar’s agucous solution.
They are stated to belong to a ribose and isoalloxazine residue.
They are stated to belong to the sugar component.
They are stated to belong to the water–soluble vitamin class.

Вопрос № 1006851

Vitamin A is an unsaturated cyclic alcohol.
The source of all vitamin A is in the carotenoid pigments, the yellow-coloured compounds occurring in all chlorophyll-containing plants.
In pure form it is a pale yellow oil, soluble in fat solvents, having an ultra-violet absorption spectrum. The ester forms of the vitamin have been found to possess greater stability than the free alcohol.
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Where is the source of all vitamin A in?
It is in an unsaturated cyclic alcohol.
It is in a pale yellow oil, soluble in fat solvents.
It is in the non-saponifiable to be present in fish oil.
It is in the carotenoid pigments, the yellow-coloured, compounds occurring in all chlorophyll-containing plants.

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Вопрос № 190672

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What is the advantage of the animal assay?
There are no interfering factors.
Pure vitamins and unknown food are used for such experiments.
Each test is repeated.
Animals can react only to the biologically active forms of vitamins.

Вопрос № 190673

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Why do ruminants require a lot of plant material to meet their protein needs?
Plants are used to get inexpensive protein-rich food.
Not all of the amino acids can be synthesised by plants.
Proteins contain a lot of amino acids.
The protein content of plants is not high enough.

Вопрос № 190674

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What is the regulatory role of vitamins?
Vitamins are utilised in reactions regulated by fats, carbohydrates and proteins.
Vitamins can be found in all living organisms.
Vitamins can be commercially synthesised.
Vitamins influence the energy transfer.

Вопрос № 190675

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What was the contribution of Robert Boyle to the history of chemistry?
He carried out studies on chemical oxidation.
He identified practical tasks of chemistry.
He determined the molecular structure of the organic substances.
He developed chemistry as a pure science.
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