A virus cannot replicate alone. Viruses must infect cells and use components of the host cell to make copies of themselves. Often, they kill the host cell in the process, and cause damage to the host organism.
Viruses have been found everywhere on Earth. Researchers estimate that viruses outnumber bacteria by 10 to 1. Viruses are submicroscopic, which means that you cannot see them in the microscope. What's interesting about viruses is that they have two or three components. Starting from the inside, you will have a nucleic acid, which can be either RNA or DNA, and in both cases the nucleic acid can be either single-stranded or double-stranded.
Then surrounding the nucleic acid will be a protein coat that's in the form of capsid, or little small units that are assembled in a certain way. That is what all viruses have. I think I have the virus that's going around this winter.
The software checks your hard drive for viruses. Recent Examples on the Web Much of the legal wrangling in the case has involved whether the law allows OSHA to regulate a virus as a dangerous workplace substance.
First Known Use of virus , in the meaning defined at sense 4. Buying Guide Our team at The Usage has selected the best antivirus software. Learn More About virus. Time Traveler for virus The first known use of virus was in See more words from the same year. From the Editors at Merriam-Webster. Style: MLA. More Definitions for virus. Kids Definition of virus. Medical Definition of virus. Get Word of the Day daily email! Test Your Vocabulary. Test your visual vocabulary with our question challenge!
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