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

Molecular biology
Environmental biology
Cell biology
Microbiology

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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. Dog in the manger

A dog that has no kennel of its own
An undersized bull almost the shape of a dog
A person who puts himself in difficulties on account of other people
A person who prevents others from enjoying something useless to himself

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