Virus

Viruses are entities that exist inside other cells and have a simple structure consisting of nucleic acid encased in a protein coat, sometimes with an outer membrane. There is debate over whether they are living organisms, as they have genes and evolve but cannot live independently outside living cells. They lack their own cellular structure and metabolism.

What is the basic structure of a virus?

• A multicellular organism with a membrane

• A single-celled organism with a nucleus

• A packet of nucleic acid in a protein coat

• A complex cellular organism

What additional component might some viruses have?

• An outer phospholipid membrane

• A cell wall

• A nucleus

• Mitochondria

Why is there a debate about whether viruses are living organisms?

• They can perform photosynthesis

• They have a complex cellular structure

• They have genes and evolve by natural selection

• They can reproduce independently

What is one reason viruses are not considered living organisms?

• They have their own metabolism

• They can move independently

• They lack their own cellular structure

• They can survive outside living cells

What do viruses require to survive and replicate?

• Sunlight

• Living cells

• Water

• Oxygen