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Viruses: Introduction and Properties

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Questions and Answers

What is the main characteristic of viruses that makes them unique from other infectious agents?

They can replicate outside of a living host

They have a cell nucleus

They contain only one kind of nucleic acid, either DNA or RNA (correct)

They have organelles and cytoplasm

How do viruses display properties of living organisms?

By growing and replicating alone

By replicating only inside living host cells (correct)

By having a cell nucleus and organelles

By infecting host cells and synthesizing new viruses outside the host

What are the components that make up a complete virus particle called?

Nucleus

Cytoplasm

Capsid

Nucleocapsid (correct)

What surrounds the nucleocapsid in some viruses?

Lipid envelope Signup and view all the answers

Where do the viral genome and nucleic acids lie in the virus?

In the core of the virus Signup and view all the answers

What type of genetic material can the viral genome contain?

Both DNA and RNA at the same time Signup and view all the answers

What is the function of viral proteins in a virus?

Protect the viral genome, provide the structural symmetry, participate in the attachment of the virus particle to the host cell, and determine the antigenic characteristics of the virus. Signup and view all the answers

What is the composition of an envelope in viruses?

It is determined by viral genome & by substances derived from host membranes, including combinations of lipids, proteins, and carbohydrates. Signup and view all the answers

Which characteristic is associated with enveloped viruses?

They can be hidden from attack by host immune system, but are easily damaged by environmental conditions that destroy biological membranes. Signup and view all the answers