Exploring the Characteristics and Life Cycles of Viruses

Mr. Anderson discusses viruses, explaining their non-living nature and how they replicate using host cells. He draws an analogy between computer viruses and biological viruses, highlighting the first computer virus. The video covers the structure of viruses, their genetic material, and protein coats. It also explores theories on the origin of viruses and details the viral life cycle, including the lytic and lysogenic cycles. The importance of studying viruses due to their role in diseases is emphasized.

What was the name of the first highly infectious computer virus?

• ILOVEYOU

• Elk Cloner

• Stuxnet

• MyDoom

How do bacteriophages reproduce?

• By mitosis

• By using the machinery of bacteria

• By budding

• By binary fission

Why are viruses not classified as living organisms?

• They do not have a nucleus

• They cannot reproduce on their own

• They do not have DNA

• They do not have a cell wall

Which theory suggests that viruses were once part of cells?

• Endosymbiotic theory

• Cellular theory

• Regressive theory

• Coevolution theory

What is a common feature of all viruses?

• They have mitochondria

• They have nucleic acids

• They have ribosomes

• They have a cell wall

What additional structure do many viruses have besides a protein coat?

• Mitochondria

• Ribosomes

• A lipid bilayer

• A cell wall

How does an envelope help a virus infect a host cell?

• It fuses with the host cell's membrane

• It helps the virus to move faster

• It protects the virus from the immune system

• It provides energy for the virus

What is the lytic cycle in viral reproduction?

• A cycle where the virus integrates into the host DNA

• A cycle where the virus remains dormant

• A cycle where the virus breaks open the host cell

• A cycle where the virus uses the host's ribosomes

What happens during the lysogenic cycle?

• The virus immediately kills the host cell

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

• The virus produces toxins

• The virus forms a protective shell

Which virus can remain dormant and later cause shingles?

• Chickenpox virus

• Poliovirus

• Herpes virus

• Influenza virus