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

Microbiology
Environmental biology
Molecular biology
Cell 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. To turn over a new leaf

To change the old habits and adopt new ones
To change completely one's course of action
To cover up one's fault by wearing new marks
To shift attention to new problems after having studied the old ones thoroughly

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Idiom
To cool one's heel

To be kept awaiting someone
To give no importance to someone
To rest for sometime
To remain in a comfortable position

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