Viruses and Their Functions

Viruses are nonliving since they lack many characteristics of life.

• True

• False

What causes the common cold?

• Fungi

• Bacteria

• Viruses

• Parasites

What is a unique feature of viruses compared to living cells?

• They are made of cells

• They can replicate without a host

• They are much smaller than cells

• They have a nucleus

What do all viruses need in order to replicate?

• a host cell

• a human

• a dog

• dirt

What is the end result of the lytic cycle?

• to lyse (burst open), releasing more viruses to infect other cells

• to destroy the cell and the virus, resulting in the demise of both

• to restart the cell cycle, causing the cell to repeat the cell cycle over and over again

• to target all viruses within the cell, killing all viruses within the infected cells

In which viral replication cycle does the host cell burst?

• Lysogenic cycle

• Lytic cycle

• Budding

• Binary fission

What happens during the lysogenic cycle?

• The virus becomes a bacterium

• The virus immediately destroys the host cell

• The virus replicates outside the host cell

• The virus integrates its DNA into the host's DNA

How can some viruses be beneficial?

• They can cause diseases

• They can turn into bacteria

• They can be used in gene therapy

• They can make cells larger