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Virus Discovery and Characteristics

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Questions and Answers

Which technique was used to discover viruses?

Cell culture

DNA sequencing

Bacterial filters (correct)

Electron microscopy

When were viruses first observed using electron microscopy?

2005

1935 (correct)

1900

1950

What is the composition of viruses?

Protein coat and lipids

Single nucleic acid and protein coat (correct)

Protein coat and carbohydrates

Single nucleic acid and carbohydrates

What is the function of spikes in the envelope of some viruses?

Attachment, identification, bridging/linking cells together Signup and view all the answers

What is the characteristic of viruses as obligate intracellular parasites?

They require host cells' machinery to produce more viruses Signup and view all the answers

Which type of nucleic acid can be found in viruses?

Both DNA and RNA Signup and view all the answers

What is the function of the protein coat in viruses?

To protect the nucleic acid from enzymes Signup and view all the answers

What is the composition of the envelope in some viruses?

Lipids, proteins, and carbohydrates Signup and view all the answers

What is the size range of viruses?

20-1000 nm Signup and view all the answers

What is the main characteristic of viruses as obligate intracellular parasites?