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Cards (22)
What are viruses considered to be?
Organisms
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How much smaller are viruses compared to animal cells?
About
10,000
times smaller
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Can viruses reproduce by themselves?
No
,
they cannot
reproduce
alone
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What do viruses use to replicate once inside a host cell?
The
host cell's
own machinery
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What happens to the host cell when viruses replicate inside it?
The cell
bursts
, releasing new viruses
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Why do viruses make us feel ill?
They damage our bodies during
replication
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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?
A
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 or
bodily fluids
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What does HIV stand for?
Human immunodeficiency
virus
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What does HIV do to the immune system?
It causes a deficiency in the immune system
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What symptoms might occur shortly after contracting HIV?
Flu-like symptoms such as
fever
and
tiredness
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What happens to a person's immune system over time after contracting HIV?
It
becomes
weaker
and
unable
to
fight
infections
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What is AIDS?
A disease where the
immune system
fails
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What was the outcome for people with AIDS before modern treatments?
They often died from
infections
or
cancer
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What are anti-retroviral drugs used for?
To prevent
HIV
from replicating
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How can people with HIV live normal lives today?
By accessing
anti-retroviral
medications early
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What does the tobacco mosaic virus affect?
Certain plant species like tobacco and
tomato
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Why is it called the tobacco mosaic virus?
It causes a
mosaic
pattern
on
leaves
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What is the effect of TMV on photosynthesis?
It prevents proper photosynthesis in affected areas
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What is the overall impact of TMV on plant growth?
Plants cannot produce enough
sugars
for
growth
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