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Course: Edexcel A Level Biology A (SNAB) 9BI0
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Edexcel A Level Biology A (SNAB) 9BI0

Topic 1 · Lifestyle, Health and Risk

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Topic 2 · Genes and Health

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Topic 3 · Voice of the Genome

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Topic 4 · Biodiversity and Natural Resources

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Topic 5 · On the Wild Side

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Topic 6 · Immunity, Infection and Forensics

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Topic 7 · Run for your Life

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Topic 8 · Grey Matter

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Quiz

6.2.1 Structure of Bacteria and Viruses – Exam questions

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  • Questions count: 12
  • Passing grade: B+
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1.
Using the table, how many bacteria are present after 120 minutes?
12
64
32
128
2.
The graph shows bacteria in a flask. Why does the population eventually fall?
Dr Dabour Hub Academy - figure 1
Bacteria stop dividing by choice
Nutrients run out and waste builds up
Oxygen increases
Viruses always appear
3.
According to the pie chart, what percentage of bacteria species are pathogens?
Dr Dabour Hub Academy - figure 2
25%
70%
95%
5%
4.
Which method best tests whether hand washing reduces bacteria?
Look at hands
Test one plate only
Wash without soap and never test
Press fingers on agar before and after washing and compare colony counts, with repeats
5.
Which pairing of bacteria and useful role is correct?
Decomposers — cause colds
Nitrogen-fixing bacteria — make soil nitrogen available
Gut bacteria — make capsids
Yoghurt bacteria — cause lysis
6.

Bacteria differ from viruses in that bacteria

contain only RNA
are cells with their own metabolism
need a host cell to reproduce
have a capsid
7.
Bacteria reproduce by _____.
the lytic cycle
binary fission
mitosis
meiosis
8.
Most bacteria are harmless or useful. True or false?
False
False, most are pathogens
True only in soil
True
9.
Gut bacteria help digestion and make vitamin K. True or false?
False
True
False, they cause disease only
True only in infants
10.
Antibiotics are effective against viruses. True or false?
True
True for colds
True for flu
False
11.
Viruses have no metabolism of their own. True or false?
True
False
False, they respire
True only outside cells
12.
Viruses can contain either DNA or RNA. True or false?
False
True
False, only DNA
True only for plant viruses
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Part of Topic 6 · Immunity, Infection and Forensics — see every lesson and quiz in this unit.
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