Understanding Viruses and Their Effects

Which statement accurately describes viruses?

• They are complex, single-celled organisms.

• They are living cells that can reproduce independently.

• They are non-living entities that require a host cell to reproduce.

• They are large organisms visible to the naked eye.

How do viruses compare in size to animal cells?

• They are about 10 times larger.

• They are about 100 times smaller.

• They are about 1,000 times larger.

• They are about 10,000 times smaller.

How do viruses reproduce?

• They reproduce independently through binary fission.

• They use their own cellular machinery to create copies.

• They utilize the host cell's machinery to make copies of themselves.

• They reproduce by budding off from the host cell's surface.

What is the primary reason viruses cause illness in the body?

• They consume all the host cell's nutrients.

• They cause the host cells to burst, damaging tissues.

• They produce toxins that poison the body.

• They block nerve signals, leading to pain.

How is the measles virus primarily transmitted between people?

• Through contaminated food and water.

• By direct contact with infected skin.

• Via droplets released when an infected person coughs or sneezes.

• Through insect bites.

What are common symptoms of measles?

• Severe joint pain and swelling.

• A red rash across the body and a high fever.

• Yellowing of the skin and eyes.

• Difficulty breathing and chest pain.

Why is measles relatively rare in the UK?

• Due to widespread natural immunity.

• Because of strict quarantine measures.

• Nearly everyone is vaccinated against it when they are young.

• The virus is not present in the UK environment.

How can HIV be transmitted?

• Through casual contact like shaking hands.

• By sharing food or drinks.

• Through sexual contact or exchanging bodily fluids.

• Via airborne particles.

What does the acronym HIV stand for?

• Human Immune Virus.

• Highly Infectious Virus.

• Human Immunodeficiency Virus.

• Harmful Infection Virus.

What is the initial effect of HIV on the human body?

• It causes immediate organ failure.

• It leads to an inadequate immune system.

• It results in rapid weight loss.

• It directly attacks the brain.