The first scientist to show that the cause of tobacco mosaic disease passes through filters that retain bacteria was
Correct answer: A. Dmitri Ivanovsky
- A. Dmitri Ivanovsky
- B. Louis Pasteur
- C. Alexander Fleming
- D. Edward Jenner
Explanation
In 1892 Ivanovsky filtered sap from diseased tobacco plants and found the filtrate still infectious, proving the agent was smaller than any bacterium. Beijerinck later called it a contagious living fluid, and the word virus followed.
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About Viruses
Viruses are acellular infectious particles made of genetic material enclosed by a protein capsid, sometimes with a lipid envelope. Their replication depends on a host cell and may follow lytic or lysogenic cycles, so viral structure and reproduction differ fundamentally from those of cellular organisms such as bacteria.
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