Idiom
The study of structures of organisms, their cells and their organelles at moelcular level is known as

Microbiology
Cell biology
Molecular biology
Environmental biology

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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. He believes in the policy of making hay while the sun shines.

seeking advice from one and all
giving bribes to get his work done
making the best use of a favourable situation
helping those who help him

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