Viruses and Bacteria

Which of the following is a true statement about bacteria?

• Bacteria exist in only a few environments on earth

• Bacteria can grow to extremely large sizes

• Most bacteria are harmful to humans

• Bacteria can be both harmful and helpful to humans

What do all bacteria have in common?

• They all have cell nuclei.

• They're all multi-cellular organisms.

• They're all single-celled organisms.

• They can all be found inside the human body

Which is usually smaller - bacteria or virus?

• bacteria

• virus

What would happen to a virus if it couldn't find a host cell to invade?

• It wouldn't be able to multiply

• It wouldn't be able to travel through the air

• Its genetic information would die

What do viruses have in common with your body's cells?

• Their genetic material is surrounded by a nucleus

• They contain many complex organelles

• They contain DNA or RNA

• They are surrounded by capsids

What does a virus do once it's inside one of your cells?

• It stays inside the cell for a while, and then leaves

• It eats up all of the machinery in the cell

• It uses the cell's machinery to make copies of itself

• It prevents the mitochondria from converting glucose to ATP

Bacteria are prokaryotes, meaning they ________.

• do not have a nucleus

• are very large

• contain no DNA

• have a cytoplasm

Which of these statements is true?

• A virus is unicellular (made of one cell)

• A virus may sometimes be multicellular (have many cells).

• A virus has no cells

Viruses hijack cells to

• Breathe and eat

• Reproduce

• Move and sleep

• Make protein and carbohydrates

Needs host cell to reproduce.

• Virus
• Bacteria
• Fungus
• Protozoan