Understanding Viruses

The video explains that viruses cause diseases like the common cold, flu, measles, and chickenpox. Viruses are found everywhere and can infect various organisms. They are not considered alive as they lack life characteristics and need a host to replicate. Viruses consist of genetic material encased in a protein layer, sometimes with a lipid membrane. They attach to host cells to replicate, often acting parasitically. A fun fact is shared about a virus potentially leading to the first cell nucleus. The video concludes with a reminder to be kind.

Which of the following diseases is NOT caused by a virus?

• Flu

• Tuberculosis

• Measles

• Common cold

Where can viruses be found?

• Only in water

• Almost everywhere on Earth

• Only in plants

• Only in animals

Why are viruses not considered living organisms?

• They use energy

• They can replicate on their own

• They have a nucleus

• They lack cellular structures

What is the basic structure of a virus?

• Genetic material encased by a protein layer

• A single strand of DNA

• A complex multicellular organism

• A cell with a nucleus

How do viruses replicate?

• By dividing like bacteria

• By photosynthesis

• By using their own energy

• By hijacking host cells

What term is used to describe viruses due to their replication method?

• Saprophytic

• Autotrophic

• Parasitic

• Symbiotic

What is a unique feature of some viruses regarding their structure?

• They have a cell wall

• They have a lipid membrane

• They have chloroplasts

• They have mitochondria

What is a fun fact about the evolutionary history of viruses?

• They helped form the first nucleus

• They evolved from plants

• They can photosynthesize

• They are older than bacteria

What should you remember to do after watching the video?

• Forget about viruses

• Ignore the information

• Study more about bacteria

• Be kind to someone today