Idiom
Hemoglobin ,the oxygen carrying substance in red blood cells,is a

Nuclei acid
Proteins
Carbohydrates
Fats

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Idiom
For each of the following sentences four alternatives are given. You are required to choose the correct meaning of the idiom or phrase given or underlined in the sentence. To plough the sands

To busy oneself in a way which cannot lead to any profitable result
To work hard to achieve one's aim
To afford hope or ground for expecting a good result
To advance one's position in life

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