Curriculum
Course: AQA A Level Biology 7402
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Curriculum

AQA A Level Biology 7402

1. Biological Molecules

0/102

2. Cell Structure

0/95

3. Exchange and Transport

0/98

4. Genetics, Variation and Interdependence

0/94

5. Energy Transfers In and Between Organisms (A Level only)

0/63

6. Organisms Respond to Changes in their Environments (A Level only)

0/93

7. Genetics, Populations, Evolution and Ecosystems (A Level only)

0/55

8. The Control of Gene Expression (A Level only)

0/72

9. Exam Guidance and Skills

0/38
Quiz

4.4.2 Using Logarithms When Investigating Bacteria – Exam questions

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  • Questions count: 8
  • Passing grade: B+
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1.
Which safety step matters when using bacteria to study protein synthesis?
Culture at 37 °C with open lids
Smell the cultures
Use non-pathogenic strains with aseptic technique
Pour cultures down the sink
2.
Using the table, how many bacteria are present after 120 minutes?
12
64
32
128
3.
Bacterial transformation occurs when bacteria
lose their cell wall permanently
exchange ribosomes
take up foreign DNA such as a plasmid
divide by mitosis
4.
Which aseptic step is needed when transforming bacteria?
Open plates in a draught
Use unsterilised tools
Smell the cultures
Sterilise loops in a flame and keep plates closed
5.
Which technique prevents contamination when inoculating an agar plate?
Leave the lid open
Use unsterilised loops
Flame the loop, work near a Bunsen flame and lift the lid only slightly
Breathe on the plate
6.
Which technique prevents contamination when spreading bacteria?
Blow on the plate
Leave lids off
Aseptic technique — sterilise tools and work near a flame
Use unsterilised spreaders
7.

Penicillin is effective only when bacteria are

dormant
dead
growing and making new cell walls
inside viruses
8.
Using the table, which process produces this doubling pattern?
Lytic cycle
Binary fission
Conjugation
Meiosis
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Part of 4. Genetics, Variation and Interdependence — see every lesson and quiz in this unit.
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