ЦТ English Language Practice Questions - ЦТ ЦЭ English Language (Belarus Centralized Testing Centralized Exam) Exam

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Read the text and answer the question: 'In 1928, Scottish bacteriologist Alexander Fleming returned from vacation to find that a mould called Penicillium notatum had contaminated a petri dish of Staphylococcus bacteria. Fleming observed that the bacteria immediately surrounding the mould had been destroyed, leading to the development of the world's first true antibiotic.' How did Alexander Fleming discover penicillin?

He synthesized it intentionally through a multi-year planned chemical experiment. He bought a foreign mould sample while travelling on holiday across Scotland. He observed the antibacterial effect of an accidental mould contamination in his laboratory. He discovered it while examining drinking water samples taken from local rivers.

Correct Answer:

He observed the antibacterial effect of an accidental mould contamination in his laboratory.

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