Scientists have removed microorganisms from inside rocks in caves in Mexico - AQA - GCSE Biology Combined Science - Question 3 - 2018 - Paper 2
Question 3
Scientists have removed microorganisms from inside rocks in caves in Mexico.
The microorganisms have been trapped there for between 10 000 and 50 000 years.
The ca... show full transcript
Worked Solution & Example Answer:Scientists have removed microorganisms from inside rocks in caves in Mexico - AQA - GCSE Biology Combined Science - Question 3 - 2018 - Paper 2
Step 1
Why are these microorganisms called extremophiles?
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Answer
The two correct boxes to tick are:
They survive in high temperatures.
They survive where it is acidic.
Step 2
Which enzyme comes from the microorganism from the caves?
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Answer
C
Step 3
Give the reasons for your answer to question 03.2
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Answer
The enzyme C is correct because it has optimal activity at high temperatures (between 55°C and 75°C) and/or below pH 4.
Step 4
Describe the 'three-domain system' of classification.
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Answer
The three-domain system is based on DNA and chemical evidence. The three domains are:
Archaea: primitive or simple bacteria.
Bacteria: true or modern bacteria.
Eukarya: includes organisms with cells having a nucleus (such as protists, fungi, plants, and animals).
Step 5
Suggest why.
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Answer
Most of these microorganisms live in extreme conditions, which is characteristic of Archaea, as they thrive in environments that are inhospitable for most other forms of life.
