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Biology 🧪
Health and disease
Virus
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Created by
Agatha Steed
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Cards (18)
What are viruses considered to be?
Organisms
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How do viruses reproduce?
By using another organism's
cell
machinery
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What happens when a virus bursts a cell?
New viruses find new cells to
infect
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Why do viruses make us feel ill?
They damage our bodies during
infection
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What are three examples of viral diseases mentioned?
Measles
HIV
Tobacco mosaic virus
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How is the measles virus spread?
By
droplets
from coughing or sneezing
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What are common symptoms of measles?
Red rash
and
fever
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Why is measles rare in the UK?
Most people are
vaccinated
against it
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How is HIV primarily spread?
Through sexual contact and
bodily fluids
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What does HIV stand for?
Human immunodeficiency
virus
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What happens when someone first catches HIV?
They may experience
flu-like
symptoms
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What is AIDS?
A syndrome where the
immune system
fails
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How do antiretroviral drugs help HIV patients?
They prevent the virus from
replicating
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What does the tobacco mosaic virus affect?
Certain
plant
species like
tobacco
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Why is it called the tobacco mosaic virus?
It causes
mosaic patterns
on leaves
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What is the impact of tobacco mosaic virus on plants?
It hinders
photosynthesis
and growth
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What are the main characteristics of viruses?
Not
cells
and not living
About
10,000
times smaller than animal cells
Cannot reproduce
independently
Require a
host cell
to replicate
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What are the consequences of viral infections on the human body?
Damage to
cells
Symptoms like
fever
and rash
Potentially serious health issues
Can lead to chronic conditions like
AIDS
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