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Science 7 - McQuaid > Unit 8 - Viruses > Flashcards

Unit 8 - Viruses Flashcards

Learn about viruses

1
Q

How many virus cells are in a single drop of blood?

A

5 billion

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2
Q

What is a virus?

A

A microscopic particle made of a genetic material that is surrounded by a protein coat

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3
Q

Directions: True or false? If false, correct the statement.

Many viruses are only billionths of a meter in diameter.

A

True

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4
Q

Viruses are not considered to be either ________ nor ____________.

A

living, non-living

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5
Q

List five non-living traits of viruses.

A
  1. They do not grow
  2. They do not eat
  3. They do not respond to stimuli
  4. They do not require oxygen
  5. Viruses are definitely NOT made of cells
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6
Q

What is the one living trait of viruses?

A

They can reproduce

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7
Q

Viruses have many different ________. However, there are ______ common ones.

A

shapes, four

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8
Q

What shape virus is this?

A

Spherical

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9
Q

Influenza, HIV, and Covid are all examples of what?

A

Spherical viruses

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10
Q

What is the tobacco mosaic virus, and what shape is its virus particle?

A

Tobacco mosaic virus (TMV) is a rod-shaped virus known for primarily affecting tobacco plants and other members of the plant family.

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11
Q

Directions: True or false? If false, correct the statement.

Polio is an example of a spherical virus.

A

False. Polio is an example of a crystal or soccer ball shaped virus.

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12
Q

Directions: Answer the statement with the best available answer.

“Space ship” viruses attack our…

A. Bad bacteria
B. Good bacteria
C. Bad germs
D. Good germs

A

B. Good bacteria

Image of a "space-ship" virus cell
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13
Q

Viruses are ___________. They depend on another __________ to survive.

A

parasitic, organism

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14
Q

What is a host?

A

A living thing that a parasite lives on or in

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15
Q

What is viral reproduction?

A

The process by which viruses replicate and produce new virus particles. They need to be inside a cell to reproduce.

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16
Q

What is latent viral reproduction?

A

A latent virus is one that enters your body and then goes into hiding, integrating into your cells without causing immediate illness.

16
Q

Explain the four steps of active viral reproduction.

A
  1. Attach - The virus finds and joins itself to a host cell
  2. Invade - The virus’s genetic material is injected into the cell
  3. Copy - Once the virus’s genes are inside, they take over the direction of the host cell and turn it into a virus factory
  4. Release - The new viruses break out of the host cell, which kills it
17
Q

Directions: True or False? If false, correct the statement.

If a virus is latent, the virus is inactive and doesn’t produce new viruses, so you won’t feel sick or show symptoms. This hidden virus can stay asleep in your cells for a long time, sometimes even for years.

A

True

18
Q

What are some causes for a latent virus to wake up?

A
  1. Stress
  2. Illness
  3. Sunlight
19
Q

Directions: Answer the statement with the best available answer.

Cold sores are a result of…

A. Latent viral reproduction
B. Active viral reproduction
C. AIDS
D. HIV

A

A. Latent viral reproduction

20
Q

The lytic cycle is another name for what?

A

Active viral reproduction

21
Q

The lysogenic cycle is also referred to as __________________________.

A

latent viral reproduction

22
Q

List four viral diseases.

A
  1. Influenza (flu)
  2. Measles
  3. Mumps
  4. Rubella

There are many more, these are just a few examples.

23
Q

Directions: True or false? If false, correct the statement.

There are medications to cure viral diseases.

A

False. There are no medications to cure viral diseases.

24
Q

How can you prevent some viral diseases?

A

By taking a vaccine

25
Q

What is the definition of a vaccine?

A

A substance made from damaged or weakened viral particles that prevents a person from getting a viral disease

26
Q

When you take a vaccine, the whole goal of it is to help your body make what?

A

Antibodies

27
Q

AIDS stands for what?

A

Acquired Immune Deficiency Syndrome

28
Q

AIDS destroys a person’s ________ system, specifically the _______ blood cells (T cells)

A

immune, white

29
Q

AIDS is caused by what virus?

A

An RNA virus named HIV

30
Q

Directions: True or false? If false, correct the statement.

HIV stands for Human Immunodeficiency Virus

A

True

Science 7 - McQuaid (20 decks)

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