3-3 Pre-Lesson 1 Viruses

Front

What is a virus?

Back

A virus is a microscopic infectious agent that can only replicate inside the living cells of an organism.

Front

What is the role of a harmless virus in genetic engineering?

Back

To carry good genes into cells.

Front

What happens to a host cell during a lytic infection?

Back

The host cell is destroyed.

Front

What is a prion?

Back

A prion is a type of infectious agent composed of protein that can cause neurodegenerative diseases.

Front

What disease is caused by prions in humans?

Back

Creutzfeldt-Jakob Disease.

Front

What is a surface marker on a virus?

Back

A surface marker is a protein on the virus that allows it to match with a receptor site on a host cell.

Front

What is injected into the host cell by a virus?

Back

DNA or RNA.

Front

What is the difference between lytic and lysogenic cycles?

Back

In the lytic cycle, the virus destroys the host cell, while in the lysogenic cycle, the virus integrates its DNA into the host's genome without destroying it.

Front

What is a retrovirus?

Back

A retrovirus is a type of virus that uses reverse transcription to convert its RNA into DNA after entering a host cell.

Front

What is the function of viral proteins?

Back

Viral proteins help the virus to attach to host cells, replicate its genetic material, and assemble new virus particles.