4. What are viruses? Give examples.
5. How yeast help in making bread
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4) A virus is an infectious agent that can only replicate within a host organism.
Eg - Adenoviruses,Megavirus
5) Yeast works by serving as one of the leavening agents in the process of fermentation, which is essential in the making of bread. The purpose of any leavener is to produce the gas that makes bread rise. Yeast does this by feeding on the sugars in flour, and expelling carbon dioxide in the process.
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