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Question

Extracts of TMV infected leaves are stored at a temperature of 0°C for two days and then injected into a healthy tobacco leaf. The leaf will
  1. be infected
  2. grow more rapidly
  3. die
  4. not be infected


Solution

The correct option is A be infected
When extracts of TMV infected leaves are stored in a temperature of 0-degree Celsius and then injected into a healthy leaf. Tobacco mosaic virus infects leaf. Because viruses are potentially infectious once they are thawed and inserted into living cells. 

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